thats not totally true...if you have ever heard of a store located in California, called the California Do It Center, which does alot of purchasing from HWI a vendor of theirs.  Well, they can actually order you a nice dark brown tarp in many various sizes.  They are reasonably priced also.  Usually it's a special order and takes about a week to get.  If can go to www.doitbest.com I think.  GOOD LUCK!!!