Assess the condition- is the print head still good?
Then flush out the ink with distilled water and leave the water in the printer if you are not using it daily.
Advertise locally to avoid shipping problems. Empty the waste tank before shipping!
craigslist.org, yahoo classifieds, this forum has a classified section,
www.inkjetgarmentprinters.com has a classified section,
www.digitsmith.com , walmart even has free classifieds now