Get them from the nice gardening/flower shop from the nicer part of town. DO NOT get them from your local hardware store, wally world, krack mart, or anywhere else.
Have had good experiences, and bad. Wally world beans were horrible tasting and made me sick for a few hours. After about 4 more hours passed, I felt better and started to feel a slight body vibe. Then I noticed the walls starting to shimmer almost like water.
The beans from the nice flower shop in the burbs kicked in much quicker without making me sick. Still tasted like crap, but not as bad.
P.S.- The reason for the flower shop and not wally world..... pesticides. I promise a water rinse will not get them off.