The other day, I was in my basement looking for a document and I stumbled across a box of collecter Barbies still their original box. I put them up on Ebay and while I didnt' get a lot, I got around $100 dollars from for 4 of them. I encourage you to go through your old stuff and do the same.
In order to save a little extra money, I check the serial number $1 bills I receive. If they begin with the first letter of my name(for example, mine is A) I tuck them away and it makes a great rainy day, reward or travel fund.