I got my VOS prototype to run with daemons turned off on my Evo Thin Client T20! I didn't even have to install over the operating system, it was already running off Windows NT Embedded! I just copied it over with a USB!!
Since the T20 is really just a rebranded WYSE 3235, I imagine you could install the VOS Server here as well with just a USB device.
Here's a sample cost estimation for a networked, redundant, fully distributed VOS system with 5 terminals and the most minimal equipment to do some monitoring and inventory management.
VOS Server (Typical Thin Client Compaq/WYSE) : $5.00 (That's what mine cost on EBay)
5x Terminals (Thin Clients of any brand running IE6) : $10.00 - $60.00 (Bulk buys offered on EBay)
Ethernet Hub : $10.00 (I fished most of mine out of the garbage, actually.)
3x Cuecat Barcoder (Serial or USB types, unmodified or declawed) : $24.00 (Ebay offer)
Barcode Label Printer : $40.00 (EBay, I also find them on sale sometimes)
Ethernet cabling : $20.00 (often free with a little scavenging)
Keyboards & Mice : $20.00 (Just bought 4 USB flexible waterproof keyboards @ $2 each)
RS-485/Modbus Cabling : $10.00 (Bought ten of these for $8 recently on sale)
Ethernet, RS-485 and RS-232 Optical Isolators : $30.00 (Typical price on EBay)
You could put a terminal in your shelter, shed, kitchen, pantry, garage, attic, basement or any place you needed one as long as you could power it and connect to the intranet. (I have been using Ethernet over power plug for my home and backyard)
Roughly around $100 or thereabouts for most setups.
Adding monitoring devices is another matter. Depends on your setup.
I have purchased BACNET/CANBUS interface devices for $12 - $18 on Futurlec. They accept the RS-485 cabling. You might be able to connect directly to your diesel or wind generator if they currently have an RS-485 or Modbus port. Most generators and power systems often do. The X-10 and I2C interfaces commonly used for household controllers will usually set you back $10-$50.
Security cameras consisting of cheap webcams around $9.00 each could connect to a UPNP port that is currently $20 on EBay. How you house, camouflage or shield these webcams from EMP depends on your setup.
We could say that it is rare it will cost more than $200.00 to turn your pencil and paper / excel spreadsheet outfit at present into the Batcave when Vault-OS is released. Compare to the countless millions spent by Batman/Bruce Wayne on his setup, with nearly the same result. What the most elite high level government shelters pay millions for you will be able to do for around two century bills.