Now here is a quick defierence between the two
Thermal will use ribbon and cost more to print with but benefits are:
smaller area needed
no fumes
solid colors will print
out door life of 5 years without laminating
usuually 15" width
can't do full color but spot colors
cheaper and less maintence for most part than a solvent print
also make sure if buy used get software with it
Solvent/eco solvent
has fumes that can be harzerdous so you will need ventalated room
can print larger and on all kind of media
cheaper ink wise
3 year outdoor life without lamination and add 3 to 5 with depending on condations
a lil pricer
must maintain daily but not as bad as
DTG ha
To buy used look for Roland printer/Mutoh Falcons/ are usually good place to look
usually will range from 3 to 8 thous and ebay I bet will have some
Check out signs101.com and other sign forum where they got people selling these suckers
same goes for thermal printer