Buy books from DealOz (by seller) or BookFinder (by book), phonecards from Phone Cards Online, and tickets from Airdig and Kayak (domestic) or Fly (international) (but check Bing's Farecast first for when to buy). Priceline can bag hotel deals. Froogle, My Simon, and Walmart sell everything else.
Broker stocks with eTrade and Goh Direct, funds with Vanguard, FX with Oanda, and treasuries with TreasuryDirect. Bank with Bank of America, Capital One, Commonwealth, Natwest, OCBC, and PayPal (or perhaps something more intimate). I owe Capital One, Chase, TD Bank, and Wells Fargo money.