Here we have an ad for a "Selectra-Print" system by a company called Micro Computer Devices (mcd). The Selectra-Print was not a printer exactly, it was a Selectric II typewriter modified to interface with a computer and automatically type your documents. This ad appeared in the January 1979 issue of US-80 which was a TRS-80 publication.
This "printer" was not specific to the TRS-80 but it was one of the computers it was available for. It only cost a mere $1925 which adjusted for inflation would be about $6900 today. The TRS-80 version was a little more expensive than the $1850 standard price, I suspect because of the interface. Though an RS-232 interface was an extra $195 so I'm not sure what you could hook it to with no extras. However, it is advertised as being compatible with a bunch of computers including the Apple II, Commodore PET and others.
Read more: https://megalextoria.blogspot.com/2017/08/micro-computer-devices-selectra-print.html
