Go to www.parkflyers.com for parts for the Cessna 182.
The 7.4V 2S lipo battery for the Cessna goes for about $35 or so.

By the way, the Cessna 182 is a great plane. Just make sure you protect it for inevitable crashes to come. The main thing is to cover major portions of the wing with clear plastic tape and also the fuselage. It will then withstand light crashes and rough landings much better.

Later on, when you have learned to control it and want a brand new body (to replace the one you will probably rough up a bit), then go to www.awlhobbies.com. They sell the complete plane, without the electronics, for about $65. Not a bad deal.

Jmir

PS - I get the same treatment at my LHS, except for one of the salesmen. I just walk away if he is not around unless I need parts in a hurry!!