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Hi, The choice can be pretty bewildering but you may wish to start with a breathable sheet, as these are more acceptable on grass pitches, however, if you are on a hardstanding something thicker may be called for but like most things weight will also come into the equation. 

Many places sell off the roll as well as set sized so you should find something suitable and there is also the many online places such as eBay & Gumtree.