Here's some pricing on Ironman suspension kits: As noted, the deal on suspension parts is the value of the tax. I'm getting hammered on the exchange, as I buy all the parts in $USD. Prices below are $CDN of course.
2" kit includes springs, shocks, and Castor Bushings.
2" kit with Nitro Gas shocks: $1038.75
2" kit with Foam Cell shocks: $1173.75
2" kit with Foam Cell Pro shocks: $1434.99
4" kit. The complete kit includes shocks, springs, sway bar drop brackets, adjustable panhard bars, extended brake lines, and castor correction plates. This kit is complete, with the possible exception of a DC front drive shaft. I have this kit on my truck, and it works great as a daily driver.
4" kit with Foam Cell shocks: $2265.90
4" kit with Foam Cell Pro shocks: $2525.00
Other considerations with the 4" and up kits, you may need a DC front drive shaft, and its a good time to check your steering damper. I can get both of these parts, with a steering damper being $113, and a DC shaft around $500. All the kits can be had a-la-carte, so if you don't need all the parts I can order only the items you need.
I can get the 6" shocks and springs too, if anybody wants. Let me know and I'll check the pricing. I don't have any direct experience with the 6" kit to comment on how it rides, though I think you'd want a built truck with bumpers on both ends or it will just be really tall.
Let me know if anybody has any questions.