mars hydro Similar to MARS HYDRO 10''x 20.75'' Seedling Heat Mat with Thermostat Heating Pad IP67 Waterproof, Easy to Clean, for Seedling, Germination, Clone, Reptile 10'' x 20.75''with Built-in Thermostat is up for auction in Patio, Lawn & Garden. The current bid is $6.50, 78% below the $29.99 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.