http://www.classicarms.us/, about a 1/3 of the way down the page, has Romy G kits for $179.95, Nodak Spud receivers for $75.00, and rivet sets for $9.95. This will provide all of the parts needed for a basic build.
Not bad if you have access to the tools to do the build.
No guns, no peace.
Know guns, know peace.