for the tank crew sets, check the usual online web store (Squadron, Great Models, Roll Models,Internet Hobbies) if there is no good LHS near you. Dragon, Tri Star, Tamiya, and many other companies make some very good sets.
As for the Panzer kit, for under $30, your best bet is online again, especially e-bay. Not knowing your skill level, it's hard to recommend a particular kit.
F is for FIRE, That burns down the whole town!
U is for URANIUM... BOMBS!
N is for NO SURVIVORS...
- Plankton
LSM