Doug here, I'm the Pottstonian of the group so I'll do the dump.

The owner, Bill Kemner, used to operate a store at the famous Gilbertsville Zern's farmers market.
For decades he and his family bought up auctions and offered the items for sale in his store and
at ham fests.  He is a Navy veteran and work on shipboard UNIVAC computers. 
A number of years ago he moved out of Zerns into this warehouse.  

Bill has quite a bit of old electronic components, two isles,  perhaps 30 feet long,  full with small bins of misc parts.
He also has  LOT of tubes- a large closet full of them ("The tube room").
He has several rooms of old A/V media, equipment, and tube radios.
Other stuff runs the gamut of  typical yard sale household items to scientific gear, including at
this time, an electron microscope... and an IBM System 30.

And yes he has a lot of vintage microcomputer gear, including software, cables, accessories.
Here's the sad part for us:  Much of the pre- IBM PC computers he has were stored in outdoor semi trailers and
much have sustained either fairly extreme temperature, moisture and in many cases outright water damage. 
That being said for some purposes the computers are useful.  He tends to be "optimistic" about what things
are worth, but you can always make offers.  Last summer he brought out a lot of additional stored computer
equipment.  There is currently a lot of Apple II+s and IIe's out on pallets.   The Apples and TRS-80s computers
usually came from schools and have school brandings on them in some cases. 

There is a also room of that is a 90s  computer store time capsule.  

A few of us locals have used trips to Kemners as a good reason to get together out here and that's been great.
I'd love to have that happen with the further away folks sometime.   Its entirely possible to burn half a day
lost in there.   If you need to bring the family on the loop, there are some not-too-far-away places of interest:
Check out Saint Peter's Village and the Hopewell Furnace Rev war iron works.

Is anyone familiar with this?

http://philadelphia.craigslist.org/for/5918505303.html

surplus and vintage electronics (POTTSTOWN PA)
114 S. WASHINGTON ST