Some DIY type subs-
Scan Speak
Dayton-They are not loud subs, but they are supposed to be very good at what they do.
Mach5Audio MAW10-super budget sub. No one has given an indepth review but most seemed pleased with it. Has excellent value and will go into a 0.5 sealed box
Some of the elemental designs subs remind me of Eclipse subs cosmetically.
Yes I agree with the warnings on woofersetc. Many big name brands do not allow online internet sales.