The connector on a Panaflo that sells for 2-3 dollars will be a 2 pin Molex KK style. These connectors are like those that are on a motherboard, but they have 2 pins instead of 3. You can clip off one of the polarity labs and a 2 pin will fit on a 3 pin.
The $2 Panaflo phenomenon is as a result of a massive amount of surplus inventory that was dumped on the California market. Some giant manufacturer special ordered these fans from Panasonic with this 2 pin connector and then probably cancelled the production run that they were purchased for. Then they liquidated them for pennies on the dollar through the surplus parts dealers.
The major Panasonic distributors buy Panaflo fans from the factory for about $4 a piece purchased in case qty(100 pieces). Then they double that cost to sell them to retailers or small run manufacturers. So you can see that the opportunity to buy a Panaflo for $2 will not extend indefinitely and you should definitely take advantage of it. Please send all the Panaflo fans to Europe that you can afford so that the surplus inventory will dry up and people can go pack to buying them for $16.