Well, doing a random search on Yahoo I found this company called USA Brass Company
Once Fired Brass For Sale
Who has supposedly once fired brass in stock. The cost for 100rds (unknown headstamp) is $30 but their shipping and handling was a bit high at $20 for a total cost of $50 shipped for 100 pieces. Seeing as how it is knee high to impossible to find any 300WM brass right now I am going to give them a try. They claim to give 2-3% extra just to cover any damages cases as well.
I will post with what I get once the brass arrives, the way I see it is that some brass is better than none, and I have to start experimenting with necking down the 300WM to 7-300WM anyway so I might as well get what I can. They have some other calibers available as well.