Greetings everyone,
I've been searching the Internet for a realistic proton pack replica at a reasonable price and, at this point, I think the following website offers the best props. I've never bought anything from them, nor do I know them, but based upon the pictures at their website, the props look pretty good.
http://www.geocities.com/facadefx/ghostbusters.htmKeep an eye out for a proton pack at
www.eBay.com too. There's a seller who has, by far, the best proton pack replica I have seen thus far, but during his last two auctions, the final bids were $1,200 and $710.00.