i paid about $340 for camber arms, and then about $240 for the upper arms, i can't remember the name he gave the upper ones. they're high quality ones, my mech wouldn't put anything less in it. if i wanted cheap ones he said to go do it myself. i'll get the brand of them tonight, he kept the box they came in and it's raining outside so i don't really want to get under the car atm.
What i gathered from the more expensive ones is quality in construction, and durability. bearings in the joints are a big issue, if they're shitty ones they'll break down relatively soon. when you start putting more adjustable joints into suspension you need to increase the quality of the parts so they don't become the weakest link in your suspension setup