How much should I sell my mower for?

[zamboknee]

I'm getting ready to sell my Honda HRX2174VLA mower but have no clue how much would be a fair price.
I've had it for 10 years or so.
Works great.
Any resources to find the value?

 

[dougand3]

Around here, I'd list for $90, then back off to $80. Back further down if no serious bites.