What is a fair price on a used Trainer: JetFluid Pro

What is a fair price on a very lightly used JetFluid Pro? What do you guys think?

$100-150 USD

https://www.ebay.com/sch/i.html?_nkw=jetfluid+pro&ssPageName=GSTL&LH_ItemCondition=4&rt=nc&LH_Complete=1