Just make sure that you read the WHOLE thread before doing anything drastic, & as for pricing, just give your local Auto Parts store a call.
Call your Nissan dealer too, you never know, they might actually be cheaper. You have the part numbers if they need them.

Negative camber is great for the race track, but it's illegal & unsafe for street duty. It's also un-necessary unless you plan to drive most everywhere at full speed. It screws up your tyres pretty quick too.