I just buy directly from their website. They always send me a bunch of samples when I order direct, which is pretty cool.
+1 great company, always generous with the samples on orders.
Cabela's in Allen currently has a few of the slider heads--they shelve them next to the jig heads. They also have some of the crappie grubs. Didn't see any of the worms.
Academy typically will have a few packets of the crappie grubs
Haven't been to Bass Pro in a while, but they should have some slider heads, worms, and grubs there.