I just got a good deal on used clip on aero-extensions at Bikes-not-bombs.
As CB is out of stock, I thought i could pass this on without it being a conflict. There is one pair remaining at BNB, they are asking 40$ for them. They are older style, (think lemond "punching" through the air, rather than Levi and his pointing thumbs)
Worth a look for the wednesday racers.