I have some Radio Shacks around although I wasn't sure what the remaining ones still stock. Also have a Fry's near work and there are a few others (Altex, maybe? and we have Mauser in the area). If nothing else I can always order online.
For me, it would be a matter of needing to know which to buy and where it would need to go. When it came time to put one together I was planning to ask you all here. But thought that I might go ahead and get some to have on hand for the future if I was going to order some other stuff from EB. As I said about the horn, I still have to weenie single one, adding a bigger, better one will be in the future but no plans for that yet.