Forest Park Army/Navy had a shit ton of Alpenflage when I was there a month or so ago. Size 54 mostly, It was all mixed up, parkas, pants, etc. Varying conditions but like $19 per piece I think.
Mine built up fine in the end but I did switch a couple parts out for surplus. Sold it to a dude before I shot it and he said it run fine and felt solid to him.
I tend to agree with @Balthaz on these. Although it may not hand grenade the quality of the parts may suck ass Or maybe not. I bought one of the WBP kits from Atlantic last November and it sucked ass. I know there are some dudes who think highly of Wbp but the kit I had sucked ass. I get that...