This is going to be a little mini advertising. We all know how paypal + ebay used to be good money, maybe for some of you it still is (lucky you!)
But a great way to make some quick money if you don't mind killing any possibility of selling on Amazon is to create a merchant seller account. It's quite simple, just go to Amazon.com. Sign up. You'll need a credit card/bank account (metabank/greendot works great btw!)
Do not do any deviant stuff for a month, the first two deposits are heavily monitored to see if you're actually a real seller or just going to be a scammy scam. Actually sell shit you have, whether it be crappy books, games or trash you have laying around. Invest $30 in supplies, and sell them. Once they sell, print out shipping labels for fre through amazon and ship them through. Get about 5 items sold.
After the second dispersement, sell items which will go quick. I recomond one or two high value items, over numerous small priced items. Try to avoid electronics if possible (everyone scams on there.)
www.amazon.com/seller-account
Good luck, don't use your real name. Keep it under $1000 to avoid having to do a tax identity sheet.
If you can continually get new metabank account numbers, and one virtual cc with about $5 on it, you can continue on this escapade for quite some time.
Yes, I know this isn't that detailed. The reason being it's quite obvious to do, but still has not been abused to the level that eBay has.