if you can't/won't go through CMP, check gunbroker. You'll possibly pay more, but they are there.
Also, shop around on gunbroker around Christmas season. $600-700 service grades will pop up everywhere, and they'll be more specifically graded and gauged.
I got mine off gunbroker for $580 two years ago. You can probably find them for around the same price if the X-mas people scramble to make some cash again this year.