Yeah, don't ever expect to pay the same price for our parts as honda parts. Trust me, I found out the hard way many times. Shop/stores just don't stock our parts, and pretty much everything has to be special order, so you're paying full price from the manufacturer, unless of course, you know some distributors. Well, I'm not certain about the s13, but for the s14 the front uses a camber bolt for correcting alignment, the rear uses bushings. I've heard for my vehicle, the rear camber can be corrected with the OE setup, so I elected not to buy the rear bushings unless I feel necessary. I'm going to run rear pillow mounts in the back, hopefully that may comensate a litlle. I have the camber bolts for the front. I figure the front bolts should be easy to install, rear bushings sound a little more complex, I would take that to a shop. And definitely go get a proper alignment done after installing shocks/springs, could be dangerous without.
Shop around, even locally. I found some good prices for shocks on the net, but called this one shop who is giving me thier price, so long as I do the install at their shop. They also gave me the best price on install, they are a new shop so I guess they need the work. Shop looked capable of doing the work, so I'll give them a shot.
oh, also try
http://www.shox.com for shocks, they gave me the 2nd best price, and guarantee the lowest price. They couldn't believe the price I got, $660 Canadian taxes in, which isn't cheap, but you get what you pay for, right? Also look for the kyb agx's for your ride, pretty sure pdm has them in stock.
good luck