$800 for springs?!?! I paid $600 for 62" Deaver race springs, which are longer and offer more travel than just a bolt on spring. Expect to pay up to $550 on rear springs.
Anyways, yes, the price can vary GREATLY depending on which products you buy and what you're going for. Here is a good break down for lifts
Complete spacer lift (cheapest route) with blocks/shackles/AAL for rear and cheapest shocks- ~$280. Good for 3" of lift, will not enhance performance in any way, but will look cool.
New coilovers- Great bolt in way to enhance the performance of your suspension. Ranges from $700-950, good for up to 3" of lift (I would NEVER lift coilovers higher than 2.5" simply because the higher you raise them, the more you kill their performance)
Rear springs- up to $550 for bolt in Deaver springs. The best option for a bolt in lift spring which enhances performance. Lifts about 1.5" in the rear, a good choice for a 2.5-3" lift in the front
New tires- price can vary greatly depending on what you choose.
If all you want to do is lift your truck a few inches to make it look cooler, then get a complete spacer kit from www.toyteclifts.com
I'd recommend getting shackles if you have a 95-04 and AAL for an '05. I'd avoid blocks. Also, if you don't mind spending some extra $$$, get Bilstein 5100 shocks instead of the crappy Pro-Comp or Rancho shocks or whatever they come with. You'd have your entire lift setup for under $400 easily, and its all quality components, it just won't make the suspension any better than it is (performance-wise).
Then pick up some 32" BFG AT KO or Yokohama Geolander ATII tires and you will have a nice truck and it shouldn't cost you more than $1000 for the complete lift and tires.
If you want to enhance the performance of your suspension then definitely plan to spend up to $2,000 for coilovers, springs, and quality shocks. That's really nothing compared to what you could spend, though. I have thousands invested in the suspenion for my '86 Toyota pickup with custom long travel arms, coilovers, triple bypass rear shocks, 62" race springs, air bumps, etc. Just an example on how expensive all this can get, but this stuff isn't really intended to lift my truck, its all for performance.