Give Guitar Center or Sam Ash a call. Talk to the warehouse and ask them if they have any bass boxes. If they don't, they can tell you what day is the best to get boxes of that size. They just throw them away, so they don't mind giving them away. I've gotten boxes from GC a few times like that.
Thanks bro, yeah, I'm going to do that in the next couple days. I was hoping that someone near by would just have one and we'd be able to make a deal. But, I'll try GC and/or Sam Ash to see if they have any throw aways.