ive ordered lots of camping equopment from amazon.com and backcountrygear.com tey have good selection and free shipping if you spend over $50
as for a tent, i never found one necessary, as they are costly and take too much time to set up. i like to use a couple of inexpensive poly tarps, (in brown or tan, blue is ugly in the woods) can be rigged up in a multitude of ways very quickly, for both rain and wind shelter.
ebay is great too, lots of cheap military gear. the $30 mummy bag is good down to -40 i think. plus lots of woolen clothing, canteens, cookware, backpacks, etc.. prety much everything youd need to go camping