We have the SP 300 and it is a great machine but used it is not worth the 14000 quote. We paid 13999, with a new warranty and shipped to us free and dealer setup and training. Sounds like it is depending on how used (was it just a floor demo?) over priced by 2-4000 dollars easy. Also a lot of guys are trading off the 30" machine in favor of the SP 540 so they can print bigger banners, making a lot of them available for 10000-11000 currently. We do not do many banners here due to a restrictive/costly city ordinance. So I prefer the 30" machine.
Good luck