Have you checked out "Beyond Your Backdoor"? It's a nature store and a new division of Lesser Jewellers.
Woodpecker Birdhouse
This nesting box is specifically designed for woodpeckers. It has an extra thick bowl shaped bottom for the eggs and a closed entrance the birds need to open themselves, just as in nature!
The best place to hang the birdhouse is a quiet and somewhat sheltered spot at a height of 2-3 meters.
There is a latch on the side for ease of cleaning each fall.
Height: 21 inches
Style: 122BB NKX
Price: $81.98