Howdy KiltedCelt,
It's true that you can never tell which specie of maple you are buying from a BigBox store. But remember, there's a lot of variation in quality of wood within a given specie of wood. So, just go through the stacks (1x2s, 1x3s,..., 1x6, etc.) and you'll eventually find a board with good grain. Or, maybe you'll find a board with marginal grain that you could back with hickory or silk (or ?).
And, don't forget to check out the stacks of Red Oak, there's a bow waiting for you in there.
All the Best,
Canoe