It looks like these blades are available to buy again, I know some people were sorry they missed the original deal
Home Depot has Diablo 9 in. 5 TPI Pruning Reciprocating Saw Blades, 5 pack for $11.62, free ship to store/pickup.
They had the single blades for two dollars apiece, but apparently they keep going in and out of stock. At this time the five pack is showing as available. Not quite as good of a deal, but not bad for 5 Diablo blades.
5 PACK for $11.62
https://www.homedepot.c