Most edible plants can be grown from seeds, including beans, grains, pulses and legumes. In order to sprout the seeds, you just need to duplicate what happens in nature.
On final rinsing of sprouted foods, you may use an antibacterial rinse consisting of 1/4 cup of un-distilled apple cider vinegar to one gallon of water. (Thanks for the tip, Cynthia Wallace!)
If you sprout back to back as each batch germinates, you will have three feedings per week in the summer and two per week in the winter. My birds all have varying preferences as to their favorite sprout. I sprout just about everything. I typically buy GARBANZO BEANS, MUNG BEANS (high in vegetable protein), A TEN-BEAN MIX, A GRAIN MIX - consisting of oat groats, rice and white millet, WHOLE GREEN PEAS ... BLACK OIL SUNFLOWER SEED, and LARGE STRIPED SUN FLOWER SEED. I also purchase quinoa, which I feed cooked, not sprouted.
AAOOB Storable Foods is a good online source for buying in bulk.
Properly packaged, dry seeds keep for a very long time. I order 250 pounds at a time and it lasts me just about all year long.
You can try regular packaged beans from the dried bean section of your local grocery ... you do not have to buy from a health-food store. If these beans do not sprout they are most likely too old.
Of course you can also cook these things for the birds and your own human family.
This is just like anything else you do in life ... the more you do it the easier it gets.