We bought our 18x33 at ProPools.com. We have not set it up yet so don't know what the final result is, but I checked them with the BBBonline and the Tennessee BB (regular brick and mortor store) and they have a very good rep. They have all ranges of items, prices, good quality and will describe even the smallest detail of each component. I had ? about the uprights and the bottom rail. They also include the right kind of sand with the filter, many do not. Prices were pretty good/comparable, with delivery included. Delivery was very fast and when one item was not in best shape on arrival due to a packaging problem, they immediately offered to replace. I think there are a lot of places people have been using. Figure out your budget (including ground prep) decide what size you want and find the best you can in your price range (not the biggest, the best) When going for oval, our choice was a buttress free, for more space in yard and neater appearance. Durability, warranty, quality as well as a company with a good rep were how we looked.