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Are you looking for a crappy Norinco or a US mfg. one? EE has (or had) some US ones. They run about $100 (you can also use a Garand rear sight). You might find a Norinco one a lot cheaper but have have replaced 6 out of the 7 rifles I have had over the years.(the 7th I put a CASM mount on). Wolverine has a great price on there left over M14 parts kit so that might be an option also. A BM59 rear sight will also work. Not worth going cheap when there are quality parts out right now.