Your topic is to subjective to give an accurate price too, it all depends on what quality of service and parts you want or are willing to pay for. Good work cost money as does quality parts. The range could be from 200-700 dollars, it all depends on what you want. Most people talk brakes, but expect a miricle for almost nothing. Quality parts like Raybestos brand brake parts will run much more then some korean junk that was made with child labor in some sweat shop overseas. Also performance will come into play, do you want better then stock brakes?? If I was to do your brakes, I would suggest you go with Raybestos Super Stop rotors, they are a performance rotor that really brakes nice. They list for 195. 00 each, and can be bought for about 115. 00 each. Also, Raybestos calipers are very nice units, they are remanufactured and work well. They go for about 60 each, with a 40 core charge. Pads, there is a huge assortment to choose from. You have the EGR pads at the top of the list for 200 a set, and the cheapo auto zone's for 30, find one you like and go with it. I will say that I am every hip on the EGR pads, they do not squeek, have almost zero dust and stop better then any pad I have tried. If you are into it, it's a good ideal to replace the front brake lines, factory style rubber ones go for 20 each with braided stainless steel/kevlar ones going for 200 a set (2 front lines and 1 rear line). Fluid should be changed out, this means emptying the resivor and flushing the system. You can go with stock brake fluid for 15 bucks or synthetic brake fluid for 35. You will need some caliper grease (syenthetic cost 6 bucks) and if the bearings are bad figure another 40-50 dollars for replacements. If you go ahead and do the rear, the drum will mostlikely be OK, so if they need turning figure 30-40 for that. Good EGR rear shoes are also 200 with cheap ones running 30-40. Get yourself a brake hardware kit, get replaces all the springs and washers with new stuff, they are about 10 dollars. If you want new rear wheel cylinders, go with the oversized ones from EGR, they are great and really help the truck stop, about 35 each.
There you have it, that would do the trucks braking system, you should also look at the E-brake cable and make sure it is ok, most time they are. Labor to install it runs 35-50 dollars an hour, you are paying for the man to install the parts, his tools, and the shops overhead. Time should run 4-6 hours.
Hope this helps, you can see you have many choise's to make, choise's that will affect both performance and cost of your new braking system.