The Carolina Quattro club is currently working on a group buy for window tint. Here is some more detail from the guy heading it up:

I talked with the guys at Formula 1. They would be willing to hold a day for us to bring in our cars and get them done. Five or more cars and they will take 20% off (so figure $240 for their best stuff....Formula One Ultimate which replaced Millenium) and 10 or more would be 30%(around $210). The manager mentioned a Corvette day they had a couple of months ago where they had more than 10 cars come in. The only catch is we all have to pay in advance to get the discount (they have been burned before with unkept promises). So I guess we need to get a final count of who would be in (call your neighbors, etc.) and see what we can do to pull this off.

This is being done at the Formula 1 shop in Raleigh. I don't think that it will be good at other shops.

If you are interested please send me an email at jakekit@nc.rr.com or even better join the Carolina Quattro list by sending an email to:
carolinaquattro-subscribe@yahoogroups.com