Wigs, since time is no doubt of the essence, go here and do a little posting[url]www.jouster.com[/url]
Slasher's advice will help you avoid a dog of an M1, if you want a shooter.
If you want a collectable, you need to go beyond that, disassemble the rifle, and begin to examine each part, comparing them to the pics and charts in Scott Duff's books. His website is linked to [url]www.fulton-armory.com[/url]. The important parts to a collector (in rough order) are: Receiver(duh!), Barrel,Op Rod, Stock group, Bolt, and Trigger housing. Most of the other parts are readily available, and can be bought/swapped at leisure.
$639 actually sounds low for an all-correct Winny, but OK for a mixmaster shooter.
And it is possible to top-off an M1, although the process is slow and somewhat awkward compared to simply ejecting the partially filled clip, and inserting a new one.
Can't have too many clips if you have an M1!