If you are in the Detroit area, Roeper School has a list of testers who evaluate gifted kids. If you download an application from their website it lists their names and locations. I think your price quotes are high for Michigan. There are some really active parent groups there, including Gifted in Michigan and Mensa Kids. If you are near FH, the Stepping Stones School for the Gifted might be able to recommend someone.
If you are on the West side of the state, it seems like there is a pretty active organization called the GT Resource Network. It is a group of parents and kids that get together once a month. They coordinate some advocacy, enrichment activities, and just social things. I bet they could recommend a tester. Or you could take a train to Chicago for testing at Northwestern CTD.
