$xx means what it looks like - $10 - $99
I would value it somewhere in the mid $xxx range, and would buy it from you in that range if you were interested. If you have received a legit $25k offer, I would jump on it.
Be careful of appraisals from anyone like Great Domains who has an interest in you listing your domains with them - they have an incentive in inflating your hopes with no consequences.