Two 6½” KLIPSCH K-1075-SV woofers (midbass drivers). I bought these new surplus several years ago.
They have IMG cones, non resonant polymer cast frames, a nice large spider, a hefty main magnet, an additional bucking magnet (shielding) and a soft foam gasket. They are well built and quite heavy for their size. 4 ohms each, so they have good sensitivity.
I don’t know the Thiele/Small parameters for these woofers, but KLIPSCH used them in their SF-1 loudspeakers. Basically these woofers were designed for bass reflex use.
http://www.klipsch.com/sf-1-floorstanding-speakerI bought four of them because I had originally planned on building myself a pair of MTMs (two per enclosure), but I never got around to it.
As it is I already have way too many speaker components on hand, some of which I’ll probably never ever get around to using.
So, two woofers for $35. You pay for shipping. They'll fit into a USPS Medium Flat Rate Box and ship for $11.35.
If you are wondering if I’m a honest guy to deal with, ask Wayner.