$1000!!!! is that for a complete A/C repair or just the conversion?
Sounds about right. Think about it, a shop is typically going to change at least the expansion valve and drier, flush the entire system, new O-rings, add dye, vacuum test, charge, and warranty it, all at shop labor rates and marked up shop prices for parts, and don't forget the charge for shop towels.
I paid $120 for the vacuum and charge. About $80 in parts to do the rest myself (did not change compressor).