Preformed ponds (also referred to as preformed 'tubs') are the most popular style of garden pond on the market because they are both reasonably priced and easy to install. Preformed ponds are simple to install compared to using a pond liner for a custom pond. All you have to do is dig a hole and insert the tub and fill it with water. However using a preformed pond tub means that you can't customize the ponds' shape to your liking like you can with a custom pond. However, with the right decoration, like rocks or plants around the pond's edges, a preformed pond can look be just as eye-catching and natural looking as a custom built pond. Preformed ponds range in price from $50 to $100 online.