Both overpriced...been on there for a while.
The 2B's definitely, I don't know the value of the 3.1 though. Both look nice, hopefully someone can get them at a more fair price.
Both are overpriced pretty good. I contacted the guy on the 3.1's and made an offer. he eluded to just keeping them if they weren't worth more than that. I did not low ball him either but offered what I generally see as going prices for this model.
Here's a couple of listings...
Polk RTA12s - $150. Funny comment in the listing... "RTA-12 speakers. Tweeter included. Price non-negotiable." These are in the LA area.
Polk RTA 8s. $149 - SFBay area
I don't know if any of those are good deals or not. I know some people love the RTA12s, so that seems like a pretty good deal on those, especially with the tweeter included. ;)
I got my SDA 3.1's in Charlotte and paid $350 iirc. And they came with some other equipment. Keep looking and be ready to pounce when you find them. Ask on here and they will steer you straight. At least that is my opinion.
That is over priced but there was a guy local to me that had a set of Sda 2B that wanted $2800 for them and would not move on the price at all even when I told him what they cost new.