On Monday, Fry's Electronics will be having a Labor Day sale. Two of the items on sale that day will be 20x Emprex drives, one PATA and the other SATA. Each will be $15 after a $15 rebate ($30 initial price).
The 20x Emprex drives are made by Optiarc. The PATA drive is an Optiarc AD-7190A, while the SATA drive is an Optiarc AD-7190S. As most of you know, the 7190 Optiarc drives are really 20A3 Lite-On drives.
So, once again:
Emprex 20x PATA (5473239) = Optiarc AD-7190A = Lite-On DH-20A3P
Emprex 20x SATA (5579820) = Optiarc AD-7190S = Lite-On DH-20A3S
And before you ask, I have no idea whether this deal will be available online with free shipping. As of right now, it's an in-store deal only.