Hot Tub

[ponokareefer]

I am looking into possibly getting a hot tub and was wanting some assistance in this area. I have been looking on kijiji for a used one, but the ones that are good prices have problems with them, and the slightly used are about the same as a new Costco hot tub. The number one thing about buying used that I have read is to make sure you see it running. Anything else?
I'm looking for just a basic 6 man hot tub for my family and a few friends to come over. I'm not wanting a built in stereo or tv or anything like that, just good quality and preferably a warranty that is good and will work. I figure the less that is in it, the less that can go wrong. Is there any place that are known for great product/price/service specifically? Is there any places to kind of stay away from due to bad reputation and/or price?
I have heard that there are a few specifically designed to be able to handle Alberta winters (-40) that are better than others, but I don't know how true this is.