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1) Deal Extreme - Your first rule for finding that random trinket you just have to have is checking Deal Extreme. There you'll find cheap items direct from China. With free shipping also, your new USB key will only run you 5 bucks.
2) eBay tricks - You obviously know how to search up an item on eBay. Even you can figure that out. The tough part is finding the good deals. Occasionally, sellers will make typos in their listings. The result is that their listing doesn't turn up in searches. That's where you come in and nab the auction with little to no competition using www.missing-auctions.com . This free site allows you to search for typos on eBay. Another tactic for getting a low price is sniping. Sniping means you wait until the last minute and 30 seconds before the end of the auction, you place a bid, giving your opponents little time to react. A good program for that is Baygenie auction sniper.
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4) Smart Canucks - Sometimes, the cheapest way to get something is to get it for free. Smart Canucks is a forum where Canadians share freebie offers, hot deals and coupons they've found online. So far, I've gotten iPod travel chargers, t-shirts, dog treats, and more. It's definitely worth checking out if you're a cheapass.