A lot of composers for indie RPGs probably take music commissions. The guys of Oliveair games offer that and even have a pricing structure.
http://oliveairgames.com/music.htmlOtherwise, Phil Hamilton of Dancing Dragon Games
http://www.dancingdragongames.com/ might be someone to contact about that. He's a very good composer. Or maybe Aaron Walz
http://www.walzmusic.com (He's done the Aveyond games and Yummy Drink Factory.) Or maybe Kan "Reives" Gao of Freebird Games (To The Moon)
http://www.freebirdgames.com