I went to Goodwill yesterday after reading this thread. Best deal I could find was a paperback copy of Seabiscuit for .99.
I suck at thrift shopping.
COOL - post a pic of the book. This thread is all about what you find, doesn't need to be if you plan to keep or sell it. I keep a bunch of the items I buy with no intention of selling them.
Goodwill is tough, but you can find some really good stuff. My goodwill near me just so happens to pull "new carts" our around 5 on my drive home from work, so I usually stop in and check that cart. Usually the best stuff.
If you're just getting in it - it takes time and I have made some bad buys. Some tips:
smart phones are your friends and amazon seller app has a scan function where you can scan the UPC to see what it's currently selling on amazon for. Give you a rough estimate at what you can get.
I always scan new in box items.
I started in shirts and t-shirts. Look for Band touring shirts, look for high quality brand button downs (brooks brothers), always check condition too.
Check and see if your local thrift shop has a return policy if so, you don't really need to worry about picking something up that may be a bust. Pick it up, do the research and then return it if you don't think it's worth it.
If you plan to sell, I aim to have a value of at LEAST 3-4x times the value of the item I purchased.
It's all fun, I love the hunt and it really is a cool feeling to find something that someone else wants (just sold a toy truck last week and it went to Italy).