The Alice Pack harness can be bought off ebay for about 20 dollars now. You can hand cut a mother board very inexpensively or purchase the aluminum piece from Multimediamayhem. I have bought a number of extra parts and pieces from them as well. The plumbing parts can be found very in expensively at specialty plumbing stores, which can save you about 40 dollars otherwise purchasing them know GB sources.
The electronic lighting can be done extremely well and cheaply by going of ebay through Zombieamusements:
Ghostbusters Prop Proton Pack Power Cell cyclotron trap - eBay (item 220632662010 end time Nov-02-10 06:28:26 PDT)
Sound can be done inexpensively by using replica props system with a speaker pulled from any computer sound speaker set and this chip:
Sound module programmable sound recorder
There are several gun kits out there and deals every once in awhile from members on the JY as well as multimediamayhem, check the GBfansite for sales. The hosing can be bought for a few dollars at Home Depot.
The shell is the most important part for accuracy and easy of popping it all together. There are several fiberglass makers out there in the hobby field and you can get them anywhere from $ 250 up to $ 600. I have found that Exoray offers a top quality shell and pieces, as well the bumper that is hard to beat. you will pay a bit extra, but it is the best in quality and durability. You can find them used or for sale occasionally on the prop hobby boards through the year, my last one I got directly from Exoray here.
Finding all the pieces on the cheap will run about $550, top price about $ 800. Its best if you can look for sales and for hobbyist that are selling them at a low price because they just don't want to tackle the project. I have built three packs myself, so I am used to popping them together but it is not nearly as hard as it looks, just have to think it through for easy of construction when putting them together.
