The nice thing about buying directly from the Snap-on website is that you will get new unmolested tools. I've been buying off of "the truck" since '90 and often tools sold as new have been "kicking around " the truck for a while and appear marred and scuffed. When I've bought sealed sets off of...
I use a Monitor brand kerosene heater. I have a 1000 sq ft Morton Pole building garage with 24 ft. high ceilings. It does a great job. The 250 gallon kerosene tank is located outside of the building. Very economical.
http://www.monitorheat.com/