I don't think they have all been sold - it appears that the demand may have created a price increase. The same part number by the same supplier is listed in this ad:

http://www.ebay.com/itm/57-270-Onsru...item4ab4f1838e

The two part numbers were

57-270 and
57-281

Whats the difference?

From what I can tell, the only difference appears to be $3 :rolleyes:

Looking at both ads, it appears that the first one was for a 1/4" cutter dia. and the second is for 7/32".

In the ad for the 57-270, the part number MPN 57-281 is listed. I assume a mistake as one is 1/4" and one is 7/32".

I now see that the 57-281 has been readvertised.

http://www.ebay.com/itm/57-281-Onsru...item4ab4fc15d3

I also see that it is not available to Canada!!!

Over the last 3 months, I've bought about 15 saw blades, including a $300 Dado set for $60, and about 30-40 router bits.
All for about 20-25% of retail, or less. Some of the prices have gone up due to demand. Originally they were all auctions, but now seem to be buy it now.
It's hard to pass up $80 bits for $14. :) Even carbide tipped straight bits for $5 are hard to pass up.

I just bought 5 more.