Running spacers question.
 

My one friend has a set of spacers that i am looking at getting, they are 10mm. I currently am running 5mm on my rears. I was wondering if stacking them would be ok, because my rear driver's side tire rubs on the inside(not on the fender)

Should i get the 10mm spacers and stack the 5mm on them or just save up and buy the 15mm ones?

If for buying the 15mm, anyone know of any local places that sell hub-centric spacers? H&R??

My spacers were $10 a peice for 5mm.

I'd save up get just get 15 instead of stacking