Would prefer free but under a couple hundred dollars is also doable.
It would be nice to have actual tif, sid, etc. files but a WMS would also work... using ArcGIS 10
Would also consider any of the free open source GIS as possible solution.
The WMS (bing and esri) I have been able to locate have holes and poor resolution in many areas of our 24k scale Turkey project. aerial problem areas here
Have attempted to use the trial versions of ArcBruTile and Global Mapper. Both of which don't provide what we need without spending too much on what looks like overpriced convoluted products.
It seems there has to be some high resolution aerials for Turkey that are free/inexpensive and user friendly to download/use.