I have one made out of recycled plastic 2 x 6 and 3" galvanized pipe. No maintenance, can't carve your initials in it and too heavy to be windblown. There are several brands. Here's one.
http://www.picnictables.com/plastic/...ic-tables.html
Unfortunately, they are very expensive compared to local made. I was lucky, and paid $25 at a charity auction. A local factory was rebuilding and donated several to the charity.
Point is, sometimes you find great bargains that are not in the usual places, so take a quick look at eBay, salvage yards and craigslist for something in your area. Of course, if you need it for a July 4 picnic....