How much are 1903 or 03A3's going for between collectors? ( I am not interested in retail)
If you have the time and ability, the CMP Talladega range and South Store typically have 1903s (and occasionally 03A3s) in stock, mostly Remington. That's where I got one of mine. Let me know if you need any help with how to purchase from them.
The current price list is here:
http://forums.thecmp.org/showthread.php?t=257387