Target offers the Vifah 8-Slat Acacia Interlocking Deck Tile 10-Pack for $50.15. Coupon code "TGTS2KN4" cuts the price to $45.15. (Overstock.com via eBay has it for slightly more.) That's the lowest total price we could find today by $2, although we saw it for $4 less last September. Weather-, insect-, and fade-resistant, each tile measures 11" x 11" x 1".
Also available is the Vifah 6-Slat Eucalyptus Interlocking Deck Tile 10-Pack for $47.59 with free shipping. (Amazon has it for the same with free shipping for Prime members.) That's the best deal we could find now by a buck, although we saw it for $4 less last September. Each tile measures 12" x 12" x 1" and features the same resistance as the above.