If you're speaking of the 68cfm Delta fan, there is nothing comparable.  The Sanyo Denki that Swiftech is shipping the units with now only puts out 56cfm airflow.  Swiftech stopped using the Delta because, at the time, they were having a hard time getting them on a timely basis and so looked around for a reasonable replacement.  $19 for the 68cfm Delta, considering the fact that, structurally, it is so different from standard 80mm fans, is not unreasonable.  Not as many are being produced, so that drives the price up compared to fans that are being produced by the tens of thousands.  I believe you can get them (the fan or the complete HSF combo) from Inflow Direct, Cooler Guys, and possibly Plycon.  All, however, are charging the same price of $79.95(give or take a few cents).