A great artist called Moomba, who has published a lot of his drawings on Shotachan, is offering cheap commissions (starting at 5 dollars), when you support his Patreon. He doesn't only draw shota, but any type of characters you like.

You can see his drawings here:
https://shotachan.net/community/threads/moombas-madness-a-mix-of-everything.2594/

Here's his Patreon:
https://www.patreon.com/user/posts?u=3998490

He has some financial difficulties right now and I think the quality of his drawings are more than worth it to support him.