Before I bought some M50s and stuck my M3s in back; I was running some fairly substantial HTIB front speakers as my surrounds, and they worked really well

Yeah; we paid what the site says(unless we got them before the last price increase)

They do have a couple of discount plans for factory seconds and quantity discount, but that's about it.

And Yup, sometimes they pop-up on the used market, but not consistently.