What 6" lift options for 72 K10?

[RShaips]

I am getting ready to install a lift for my 72 K10 project. I called and checked on lift kits and the only one that I found available was a Skyjacker for about $1200.00 thats about $500.00 more than I thought I would have to spend. I want springs all around, no blocks. The 4" lift kits with all springs was around $500.00 from High country and Superlift. Why is the 6" not available in anything cheaper? I could use the 4" but I am running 35" tires and didn't think that was enough. Thanks rich