Well, I haven't been here for a while, suprised this thread is still running.
CMP has revised it's rules, you may now but two "service grade" M1's per year. Additionally you may also purchase a "Danish M1" (these were lent to daneland and retuned).
I ordered my second one two weeks ago. Hopefully I won't be as impatient this time.
I have seen clips for as low as $35 per 100. I think it was Fulton Armory. My friend got a box in and they were brand new looking. Check Shotgun News.
Enjoy.
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Blackie
NRA, GOA, ISRA