This is one of my favorite hobbies! I started this after my kids joined scouts.

100% wool blankets for 2.99 to 6.99 dollars.

Nalgene bottles. 99 cents to 2.99 dollars I always keep an eye out for stainless steel bottles, but most are el-cheapo with small mouths, kinda useless....

Sleeping bags. 1.99 to 6.99--- (the 6.99 was a 20 degree bag that still had the price tag on it- well worth the trip)

Camping stoves- found many, but most of the time they are very worn...did find one butane model that looked brand new.

We even have a computer- focused goodwill in our area- 17 inch Lcd monitors for 15-20 bucks, gotta love it!