A hot tub is actually on my list of things to buy for the back yard, this is a fun option! Walmart has the Intex Pure Spa 4-Person Inflatable Heated Bubble Hot Tub for only $349 Shipped! (Reg. $639) This can seat up to 4 adults and is portable which is super nice. This inflatable model is ready for water in about 20 minutes and can be deflated for easy storage or transport (pump included).