The Polars typically don't command a high price compared to other Bear bows, being considered "target bows", and most being of lower draw weights. The white limb faces also make them a poor choice as a hunting bow. As for value, I would suggest doing a search on the big auction site, then search for "find similar items" and compare pricing to average out. I think you might be pleasantly surprised. I have had several on my watch list over the years that ended up selling in the $100.00 range but I wasn't buying at those particular times.
Good luck in your endeavor; hope you get it.