They have coined the phrase "spendster". A spendster is someone, who in a moment of weakness buys something they think they really need and realize later they made a bad choice. A spendster might waste money using credit cards, not budgeting or purchasing an item and never using it.
Spendster.org has tons of videos documenting "spendsters" and their impulse purchases, a featured blogger section and a spending calculator thats determines how much money spendsters waste. This website gives a whole new meaning to "A fool and his money are soon parted".
A bargain hunter site is a website that offers huge deals and rebates online or in local stores. You can sometimes find items to resell on Ebay. Spoofee is my favorite.