Get this Intex 4person Pure Inflatable Spa, originally $699.99, for $329.99 at VM Innovations via eBay. Shipping is also free on this spa. We couldn't find it anywhere else for less than $357. It has two replaceable filter cartridges and a built-in hard water treatment system. It has a temperature range of 68-104 and holds up to four adults. There is a one year limited warranty.