reasonably priced 4ohm 15" driver with low Vas to use in vented subwoofer?

[sadams]

Looking for a good reasonably priced 4ohm 15” driver to use in a vented box that is not as big as a Buick. I love Parts Express, but often times when I find a driver on their site that fits my needs it has been discontinued, the Dayton QT385-4 15 Quatro for example. This driver had a Vas of 5.89 for a 6.5cuft vented box with an f3 of 19 hz, and wonderful specs otherwise, all priced under $100. Does anybody know where I might find a similar driver? Maybe a better question is where else should I look other than parts express? Thanks