How much $$$?

[leafsrock]

My roommate got a new 24in dell monitor and will no longer be needing his 2001FP 20inch monitor so I'm going to buy it off of him. Fwiw, I agreed to buy it off of him before he decided to get a new monitor and the monitor is in good condition(used ~1yr). What's a fair price/a good way to decide a fair price?

Relevant info:
Ebay says $185 - $300 for 2001FP in good condition
Friend A says to pay him $350 (?)
Friend B says 200 max.

What to do OOT?