First, ignore the post above mine, it is link spam.
Second, I would be thrilled if someone offered me $150 for limoservice24 and I'd trip over my own nads running to the 'accept offer' button or whatever.
Was it an email offer, or thru Sedo or Godaddy? It's a hard call to make unless you know who the buyer is. If it's a domainer and the offer is thru Sedo or Godaddy then I really doubt they'd pay more than 150 - 200 tops reseller price. If it's an end user, you really don't know how much they'll pay until you know how big their biz is, and how big their pockets are. Do you know who made the offer?
If the buyer is unknown, I'd probably take a chance and ask for 300. If the buyer is known, I'd do some research into the size of their company, the domain name they presently use, etc, a lot of other factors come into it.
IMO, a valuation for your name would be:
reseller = anywhere in the xx range
end user = anywhere in the low to mid xxx range, unless they are huge and really want the name.
Let us know how it goeth
