Yep, black market gotta be sneaky about it it don't want the cop knocking at the door cuz of seekrit exchanges
:P hehehe I kid i kid.
Have no clue what kind of free gift bags or door prizes, cuz I've never gotten one or seen anyone else get one. They tend to have this raffle where you do get 1 free ticket at the door but the drawing isn't until the end and you must be present to claim it if you are the winner which sucks for people who don't have all day, and the auction can drag on and on and on and on, so it ends randomly whenever. Can be slow and boring, can also move item that you are interested in up to the front for $2 each. Also there is a quick sale table where you can buy certain items immediately.
Basic plants, tends to be a lot of big java fern, moss, big full bags of DUCKWEED (seriously? and people actually buy this!), crystal shrimp, red cherry shrimp, cichild, guppies, used equip.... lots and lots of used gravel/sand, some used tanks of various sizes but they look really nasty like got some crusty stuff, one time there was dry aqaurium ferts,...
LAst time I picked up half a bag of Amazonia substrate.