this one may not be a mistake, but it seems that amazon.com has just dropped prices on many mid-range power tools around 20+%. For example, the PC plunge router kit is only $216, the Bosch router kit is only $175, the Delta OSS is only $152, etc. Add to this the additional $25 off if you can top your order off at $199, and these prices are really a deal.
I'm assuming that this is a temporary sale. I just bought my Delta OSS for $151 (less $25 because I got some other Delta stuff to raise it to $199).
Good luck.