Garlick (UK) makes a good set of scrapers for about $25.00 USD, 4 shapes. They stay pretty sharp, and are versatile. On the other hand, my Buck hunting knife works well, and doesn't cause much hand fatigue, but I've been using knive nearly 70 years. But I am only working on my first self bow!
Haven't had much luck with draw knives and spoke shaves, still have to relearn how to use them. Like the other guys said, flea markets, antique stores(more$), junk stores, maybe pawn shops and garage/estate sales.
Hawkdancer