If anyone is shopping for gym mats for floor padding/insulation, Woot is running them for 60% off: http://sport.woot.com/offers/interlocking-foam-exercise-mat-6-packs-1?ref=w_gh_sp_6_d_ph
$17.99 for the following:
Includes 6 tiles and 12 border edge ends
Each tile measures 24" x 24" x 1/2", covers 24 square feet total
Made out of high density Premium non-toxic EVA foam for the greatest durability and comfort
Double-sided gripped surface will make it grip to the floor or carpet to prevent injuries
Protect your floors while providing a comfortable workout area
Use under heavy exercise machines to dampens vibration reduce equipment noise and protect your floor or carpet
Can also be used as an anti-fatigue play mat for playrooms and daycares
Lightweight and easy to assemble
Water, mold and mildew resistant - makes it easy to clean!