REL Acoustics just replaced their previous generation of subwoofers:
T/5i
8" sealed, 550 GBP (or 756 USD)
T/7i
8" passive radiator, 850 GBP (or 1169 USD)
T/9i
10" passive radiator, 1000 GBP (or 1375 USD)
As of today, here's the new generation:
T/5x
8" sealed, rated 32hz at -6db, 650 GBP (or...