I recently bought a K-3 and DA 18-135mm WR kit and bonus 8GB FLU-Card from
Pentax DSLR | Camera-Warehouse for $1545.00. That price is still available on their site. Good people to deal with.
Serial number 4970729. It came with latest firmware. I have had zero problems with this kit. I also got a D-BG5 battery grip and extra D-LI90 battery.
I have a Pentax AF-360FGZ flash and a Metz Mecablitz 52 AF-1 flash. The AF-360FGZ was problematic on my K10D and the Metz 52 AF-1 was more predictable. The K-3 has exhibited much improved flash performance with both flashes.
I am very happy with my purchase.