I really like the military ECWCS gear - you just can't get a better deal on Gore-Tex.
GI ponchos are a great multifunction piece of gear.
The bivy sack from the USGI modular sleep system can be had on the cheap and is very handy.
Wal-mart sells a 3-pack of rip-stop ultra-sil nylon dry bags for 9.95 (sold under the brand, Outdoor Products I believe). They are excellent! The seams are all taped and they are reasonably dunk proof. I use them to organize the stuff in my pack and keep it dry at the same time.
I have those stuff sacks from wally world too, great deal. We used them whitewater rafting on the Ocoee and we use them horseback riding. Haven't had any leaks yet but we've only had them a couple of months.
Also, my BIL gave me his boyscouts mess kit a couple weeks ago. Awesome mess kit but since mine was free I don't know what they regularly go for. Only issue is that it's definately a one person mess kit.
Lastly, if you like cast iron, I got an 8 inch skillet at the flea market (refurbished and reseasoned) for 6 bucks and my Grandma gave me two 6" cast iron skillets about 3 weeks ago.
David