Sadly, open-market military issue Carbines are stuck at the $1500-1800 price point.
The dba Inland and dba Rockola version are using castings made by AO/Kahr for their replicas--no small end of bad press on those. Used dba Inlands are down around $800-900--and you are typically getting less than what you pay for at the price. New, the dba Inlands are down to $1000-1100.
If a person is committed, and keeps really, really tight watch on the CMP & Carbine fora, military version are available in the $800-900 range. Just not often. All too often from widows and estates.
Find a rare original, National Postal Meter, Rockola, Standard (especially UnStandard) and two grand is an entry point.
It's the modern reality.
All those barrels of $25, $50, $100 carbines were bought up. Just by other people. And, most of those people have kept them.
Now, only about $1500 for what is a hand-tuned, generally 'correct' Carbine is a pretty good deal versus some used Carbine with an unknown past.