[nfbcs] PC's with a serial port

[Tracy Carcione]

I'm looking around for a new desktop.  I am using an older Alva braille 
display, which runs off a serial port.  I am having trouble identifying if a 
PC I'm interested in has a serial port or not.  Sometimes it's in the 
technical specs, and sometimes not.
Is a serial port no longer standard?  Does the USB to serial adapter work 
just as well, or is it slower at passing data through?
Would anyone care to recommend a desktop, or a place to look?  I've been 
looking at Amazon and TigerDirect.  I tried NewEgg, but didn't see much I 
fancied.
Thanks.
Tracy