I actually also picked up one of those Desert Storm parkas, when I was vacationing in Washington D.C.
It was about 20 dollars (no tax!), and came with a liner.
Oddly enough, I found out the liner was a sort of pile liner used in the m51 fishtail parka. It guess since the coats are similar, it (kind of) fits. There are fewer buttons on the fishtail liner as opposed to the m-65 style one. I can't tell if it was lucky to get this type of liner, since it might be worth more, or inconvenient since i have to find a desert storm liner now.