I think most likely, you get a lower sized SSD mSATA SSD or no SSD for the $99 version. The website at
http://utilite-computer.com also does not really say how much RAM you get in the $99 version, but I guest there would be different models with no RAM or different amount of RAM like 1GB, 2GB, and 4GB depending on price.
I wonder could this computer startup from a MicroSD Memory card, USB external CD/DVD drive, or USB drive to run Ubuntu which can run from a USB drive, CD/DVD, or MicroSD card.
I bet this PC uses regular DDR3 laptop ram, so it should be pretty easy to find cheap used RAM from eBay, or take out a stick of DDR3 RAM from a laptop to use on this computer.
I notice you get a lot of ports, and connections with this computer since it has 2 Gigabit ethernet ports, HDMI, DVI-D, Wifi, 4 USB ports, 2 line-in/SPdif audio ports, USB OTG, and 2 RS232 ports.
It also only uses 3-8W of power.