Buy.com has the Logitech Z 5500 Digital Home Theater Speaker System on sale for only $169.99 after a $40 mail-in rebate (expires 3/30). That's almost $50 less than our previous posting and over $200 less than Staples price! The 5.1 system features four 62-watt satellites, a 69-watt center speaker, a 188-watt sub, and a control pod with remote. It is THX-Certified, and it decodes Dolby Digital, DTS, and 96/24 PCM without any additional hardware. Plus, shipping is free, no sales tax (except CA, MA, MD, TN), new Buy.com customers can use this $5 off $100 coupon, and new Google Checkout users can get an additional $10 discount (you can't get both).