Hello!
I'm glad you've come here to offer payment for some fine pixel art, but I think you may be offering too little for a professional artist.
However 80x80 px is large, and you're looking to emulate a style of art that is very polished and professional. At the rate you are offering, of MAXIMUM $90 for 44 frames, you're giving someone $2 a frame. If an artist wants to work for minimum wage, which is about $10/hr where I live, they would be spending no more than 12 minutes per frame. That's certainly possible, but I think a self-respecting artist might expect at least $15 to $20 an hour, so you might have to reign in your expectations about quality a bit there!
Regards.