I know Microcenter isn't a small shop, but I found 99% Isopropyl alcohol for much less than on amazon. It totally depends on the product, and where you are but I've legitimately been able to find cheaper products off of Amazon than on it. Even if it's just saving $10 buying direct from the company.
https://www.microcenter.com/product/451968/puretronics-technical-grade-isopropyl-alcohol-999-32oz
It's out of stock on Amazon right now, but last time I bought it I paid the same price for 16oz bottle.
ETA: Another one is buying from specialty stores. I'm a photographer and videographer and B&H is cheaper than Amazon 99% of the time. I got a lens $200 cheaper because it was on sale versus full price on Amazon. You have to actually look, but you can find better deals.
Something like this ?
Amazon Brand - Solimo 99% Isopropyl Alcohol First Aid Antiseptic For Technical Use,16 Fluid Ounces https://www.amazon.com/dp/B07NFSFBXQ/ref=cm_sw_r_cp_api_i_JdBcEbXZ4Z70P
As a side note, you can try using isopropyl alcohol or Goo Gone to get the paint off your controllers.
Amazon Brand - Solimo 99% Isopropyl Alcohol First Aid Antiseptic For Technical Use,16 Fl Oz https://www.amazon.com/dp/B07NFSFBXQ/ref=cm_sw_r_sms_apap_6WfhadgE3yQFS