Odd lot stores like Ocean State Job Lot sell them.
Big Lots has a pretty nice selection in their stores...several gauges and many sizes and a reasonable price.
There is were you can buy inexpensive tarps from -
http://www.amazon.com/Tarps-Tarpaulins/b...
Tarpaulins can offer an inexpensive, useful tool for many kinds of camper, whether as part of a larger, heavier tent, or as a shelter by itself for campers concerned with the weight of their pack.
Whether a tarpaulin is to be used as a groundsheet or as a shelter, they must hold up to conditions like any other camping equipment. It is important that the material should be waterproof; indeed keeping campers and equipment dry is perhaps the primary function of a tarpaulin.
Tarpaulin also needs to be sturdy, and able to withstand the great deal of wear and tear that it will inevitably face. This strength has the added benefit that tarpaulin can provide shelter from wind, which is important if the tarpaulin is to be used as a shelter. As a general guide, the higher the GSM (Grams per Square Meter) of a tarpaulin, the stronger and more resilient that tarpaulin will be.
Wal-Mart!
This place has great Tarps..http://www.seriousdeals.net/TSFf
I will use them to cover flower beds in garden. Thanks
