The best bang for your buck is going to a get together that one of the tuners is also attending. They usually offer a nice discount for the event. For example: at the upcoming Carlisle Chrysler Nationals, Tony from TVT Designs is offering ECU tunes for $315, I think. Check the Carlisle thread, post #95 thru #105:

https://www.crossfireforum.org/forum...t=16742&page=3

I beleive that Rob from NeedsWings is attending the Woodward Dream Cruise and is offering tunes. But I don't know the price.

In my opinion, $640 for an ECU tune / chip upgrade is ridiculous. But then again, some folks paid a lot more back when there were very few choices available.