It's been a while since I've done one. Don't get me wrong, they're not all that hard, except on some of the newer vehicles that have things like transponders in the keys, key sense wires, bulb test wires, VAT systems, etc. Tell ya what, let me do the one in my truck (hopefully soon!) and I'll see how that goes and let you know.
I wouldn't recommend getting one from Sams. Some of the cheaper ones tend to be of "lesser quality." The wires aren't as thick as they should be (yes, I have seen some that have burned a car to the ground), they don't last as long, and they develop problems. If it were me, I would spend the money to get a good one. If this thing is gonna be starting your truck for you, without you needing to be nearby, you want it to work properly. You don't want it overcranking the engine, or leaving glow plugs on, or something like that.
Some good brands are Avital, Pursuit (Audiovox), Clifford, Crimestopper, and Code. Call around for pricing, both installed prices, and just parts prices.
-Tim