Going to be tough to find a full original KS copy as well as being extremely expensive. Your best bet if you can't find one and want that stuff is to wait for CMoN to run their next KS expansion for it and get as much of the original as an add on.
Except that none of the original KS stuff will be there as they were exclusive to that first Kickstarter campaign.
If you are looking for the Guild master Box, with the Nameless Campaign and those things, your only real option is eBay. Unfortunately, due to it being a KS exclusive as well as being over a year old now, you are going to be looking at around $400-$500 for just that box these days. If you get lucky and come across someone willing to part with one for less, then priase them for their generosity and snatch it up as soon as possible.