I don't believe I've ever heard of the Bic F-7. Frys.com often runs the Klipsch sub-12hg for under $300 w/promo code. Sometimes they offer shipping, sometimes they don't. I like that sub a lot for under $200 and I had a couple of them in the past. The Polk PSW505, which is currently $189.99, is also a solid performer in this price range. From my experience with owning these subs, I would pay the extra $40 or so and get that over the Dayton sub-1200, which has a really cheap build quality.
Subs>RBH I-12e/I-12. HSU VTF-15H mk2. Monolith THX 12(x2)/THX 10(x2). XTZ 1X12. SVS PB-1000(x2). Speakers>JBL 270/235c/230/225c, Arena 130/125c. Jamo S807/S803. Infinity P363/163. Pioneer FS52/BS22A/C22. Sony CS3/CS8/CS5. QA 3020i/3090Ci, 2020i/2000c. Monolith AM Cinema 5 bs. Polk RTiA1/CsiA4. Other Audio>Sony MDR-Z7m2, WH-XB700, XB32, XB31.JBL Live500bt. Logitech GPro HS. Plantronics RIG 500 Pro HS. LG FH6,RK8,PK5,PH4. UE Boom3.