Unlike the first two commenters, my workshop consists of a scroll saw and ....... that's it. So I buy all of my hardwood in already dimensioned pieces, usually from Ocooch Hardwoods. I look ahead to what projects I may be doing in the near future and order accordingly. I am sure I pay a lot more but I work with what I've got.
If you want an easy/cheap hardwood to start with, visit your local big box store and get some poplar. Cheap wood and easy to work with, that way you don't break the bank if you are just "practicing".
I keep 1/8" Baltic birch around just to use as a backer for fret work/intarsia projects.