Most Japanese bayonets have reached the $100.00 - $150.00 plus range. They can go for higher, and that depends a lot on the condition and the manufacturer.
Added: Just did a quick check it seems most from this manufacturer are listed at $200.00 plus. Trying to find some completed sales.
Added: Found bayonets from this manufacturer are selling at the max $150.00 and most are the late model (Last ditch) ones with a straight quillion. So somewhere around $100.00 and up depending on condition and completeness IE bayonet and scabbard.