Given the project is FOSS, they'd probably be fine with that price still.
I could go through a list of literally hundreds of artists where $20 is within budget. The quality of simple logo like is needed here is about on part with what many would do for a telegram sticker, which are often about $5/piece.
Hundreds of dollars is totally reasonable if commercial. This isn't.
Here, here's someone I'm commissioning now, a basic sketch is $10 https://www.shiroganestudios.com/work/commissions
Given the project is FOSS, they'd probably be fine with that price still.
I could go through a list of literally hundreds of artists where $20 is within budget. The quality of simple logo like is needed here is about on part with what many would do for a telegram sticker, which are often about $5/piece.
Hundreds of dollars is totally reasonable if commercial. This isn't.