I would say ~$100 for the back 3 and ~$150 for all 5. I personally wouldnt tint the front windows too much though as it can get annoying at night and most cops dont like it either :bash:
I had my windows tinted 5% on the sides and rear window 1 piece and 35% on the windshield 1 piece with Llumar High-Performance Metallic and it cost $200 with a lifetime warranty. My major problem was the tint is really metallic and stopped my sun-pass, which is a radio for tolls, from working I had to cut-out the area above the rearview mirror that has the matrix pattern so it would start working again.