Both M48 and M48A have been plentiful this year from several dealers. AIM Surplus had them available in three grades for awhile.

Most recently, Allan's Armory has posted a few of each, and it appears a couple are still available. http://www.allans-armory.com/aaresult.php?PageId=32

I have done business with Allan several times and have been perfectly satisfied. Good luck.

Mike