Panzer Nachladen (Reload this tank)

I snagged the old Nichimo Panther G the other night on ebay, for under $18 including shipping. Add a PE set and some AM tracks and it makes into a respectable kit. Just be persistent... it'll come.

If you have a local Hobby Lobby, check their model aisle, particularly when they are running a 40% off coupon.  The kit selection, particularly armor, is pretty light, but you may get lucky.  The local Hobby Lobby by me has 2 or 3 Axis armor kits.

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.