rear alignment tools recommendation
 

i just lowered my car with Apexi EXV N1 coilovers for about 1.5 inches front and rear, front alignments are within factory specs now but the shop could not do anything with the rear unless i install a different rear control arm. any recommendations on what kind of tools out there that can help me adjust rear alignment. right now my rear is about 2.5 degrees negative camber.

Nothing really besides an aftermarket lower control arm.

what are some most popular ones? not looking for crazy adjustments, just to get rid of negative cambers.

Cheapest are stock alike spc/whiteline/eibach, from better ones i'd go for velox/verus one.
P.S. There IS way to change camber in rear w/o aftermarket adjustable LCA, but it involves changing/pressing in eccentric bushings, which are PITA to adjust, takes more time to install (=more charged for work), so better go straight away for adjustable LCA. Something like SPC's for $230 is cheap enough imho.

If you don't have to worry about corrosion (you are in socal) get that good shit, SPL

You might just run with -2.5 camber, zero toe, and rotate tires every once in a while (theoretically only ONE properly timed rotation is necessary). -2.5 is streetable IMO, and better for ultimate lateral grip! With zero or minimal rear toe the "camber wear" you get might not be that bad.