After Right Start marked down their Britax boosters (see this post), I was confident Amazon would follow suit. Sure enough, most of the Britax Frontier 85 Combination Booster Car Seats are down to $199.99. All colors are now included!
As for the Britax Parkway SGL Booster Seat, the only one beating the Right Start deal right now is the Livia color, which is $99. Hopefully the other colors will be marked down shortly. Price is now up to $103.31.
Both of these seats are at awesome, buy-it-now prices! Plus, everything is tax free (in most states) with FREE shipping.