I'm not a musician, but in my experience I can tell you that with just $100 (and that's USD, which I believe has more value than AUD) you won't be able to afford anything with reasonable quality. Even MIDI controllers that you can only use to play plugged to your computer are more expensive than that.

When I decided to learn piano 4 years ago I went with a Roland FP-30, which is a semi-decent digital piano with 88 weighted keys and no visual interface that has full support for USB and Bluetooth MIDI 1.x and General MIDI Level 2. However its price floats around $500 EUR, which according to Google's currency converter is close to 800 AUD.

Whether you want a decent board with internal sounds, or, a midi controller which would allow you to use the sounds included with Logic, $100 isn't going to get you there. Sorry to be the bearer of bad news! I for one cannot play non weighted boards. I prefer fully weighted or at least semi weighted full size keys as I started with acoustic piano. My dream board is probably the yamaha Montage 8 or one of their Clavinova digital pianos. Both are out of my budget though. I currently use a Native Instruments Kontrol s88MKI with the Native Instruments Komplete 12 ultimate library. While the sounds are amazing and the built in accessibility is a real game changer, the board plays like ass. I hate it! The accessibility is what has me sticking with it for the time being.

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I suppose you could save up some more money and try to find a second hand Studio Logic midi controller, an older Korg or roland, or a Yamaha Motif 7 or 8. If you don't mind springy action with no weight, then the Yamaha Motif 6 would suffice. I owned the Yamaha S90ES and that board played great and had some really good sounds for the time;especially the acoustic pianos. I liked it so much that I recorded a whole album using just the stock acoustic piano sounds for most of the songs. One word of advice though, stay away from the M-Audio boards. the two of them I owned were awful.

Shitty tech trend = make a call to the brand.

NOT to customer service, but to their media department. THAT is where you will get action.

How to find them:

On most sites, you will find a search; look for “media” or “media contacts.

Or find press contacts in wherever they list their braggy press releases. Wherever THAT person is listed, email or even better, call their cell.

Blind people make sighted people uncomfortable, so be polite but PERSISTENT.

“I’m blind, and I don’t see any accessible features on your X, Y, and/or Z. Can you tell me what my options are?”

If they don’t help you, have them spell their name and title. That will REALLY unnerve them.

(All PR people know why someone wants the correct spelling of a name: it’s to give it to a reporter... which is exactly what you will do.)

The more of you who do this —demand accessibility— the quicker they will see the need.

— I have glaucoma; I can see still; my mom is blind.

P.S. P.M me if you need more tips

I am in the music seen a little mostly sound engineering. $100 is getting you no where a good studio set up I usually will steer someone towards is at least $400 a good preamp for over $100 already a mic for either about that much or 200 and 300 for quality and yeah. Sorry not going to happen.

I'll add to the overall issue that $100 isn't going to get you anything worth having. I use a Yamaha digital piano people-140 series that I bought around 2005 and it's lasted perfectly all this time. It has MIDI in/out, a pedal, great sound, and worked perfectly when I used to make music with Reason and now works great with Garageband and Logic. 88 weighted keys, metronome, a few on board voices and effects and reverb,and is great for performance, playing, and practicing!

I'm a musician, and although I mainly play guitars I have a keyboard just for noodling around on and working stuff out. I just sold a Korg. Problem is you're not going to get far for that money. You can get decent weighted keyboards for a lot less that you used to, they used to be thousands and they're now hundreds, but not one hundred.

I'd say save up until you can spend a few hundred more and get something that'll last you ages.

I'm currently thinking about buying a keyboard too. I had the opportunity to test the Casio PX S1000 which my father bought for himself. The keys feel amazing, really close to an acoustic piano. I'm not sure if I want to spring a bit more to get the S3000 as it has some additional functionalities, mainly more sounds (700 simulated instruments vs 18). They also sound very cool and after some research the price is currently pretty unbeatable for what you get (about 650$ for the S1000, 900$ for the S3000).

The biggest minus is that a lot of the controls are touch buttons (such a shitty tech trend for the visually impaired ...). I still have some vision and I already thought about marking the buttons with sticky dots to add tactile markers. Plus there's the ability to connect to the keyboard with an app and to change settings this way, although I do not yet know how accessible that app is. I plan on testing that in the near future.

Not sure if this is of any help for you, but since I spent some time ruminating this recently I thought I'd share.