Digikey has them listed as a "blower" as compared to a tubeaxial for a more traditional CPU-style fan. Searching ebay for "12v blower" returns results like you're looking for. Another name is centrifugal fan but I think that's usually for the larger versions, not the size you're looking for.
The weird pricing you're seeing I beleive is sellers effectively "delisting" their item while still having it still listed. No one is going to buy it at the high price buy links to it still work for search engines. Reasons for this would be temporary supply disruptions, going on vacation and not being able to process orders, etc. It could also be an automated posting that has an error in a conversion somewhere.
The weird pricing you're seeing I beleive is sellers effectively "delisting" their item while still having it still listed. No one is going to buy it at the high price buy links to it still work for search engines. Reasons for this would be temporary supply disruptions, going on vacation and not being able to process orders, etc. It could also be an automated posting that has an error in a conversion somewhere.