Google has been acting funny lately. I only see ~20000 results. I don't think it's SafeSearch or whatever either.
Anyways, it's a nice little domain, personally, I'd probably take the $100 offer, but if you hold out for a little while I'm sure you'll get offered more.
All TLDs are available (except .com obviously) which gives us an idea of the overall value. However, this is a great niche domain so hold on to it until you sell it for a comfortable price.
Estimated value? High XX, but as your offer has indicated, try and sell it for low XXX.