I agree with the gentleman from Vermont. Nice cutting boards by the way!
I would add a few additional coments as follows:
1. I would NEVER put any wood product in a dishwasher. I see people do this and I cannot believe my eyes. One incident is enough to ruin a nice hardwood board. If the bamboo cutting board is indeed dishwasher safe it would indicate to me that it is primarily plastic resin bonded layers of bamboo veneer. This material is hard and abrasive to cutting edges. Why go there? A quick handwashing is more than adequate to clean and wil not harm sealed wood products.
2. All wood products are renewable resources. Bamboo, which is actually a grass just happens to grow faster than most trees. The CITES treaty which governs trade of endangered species (plant and animal) does a pretty good job of restricting trade of over-harvested species. No one needs to feel guilty about buying a wood cutting board. If you want to protest an irresponsible use of wood, how about pretesting cutting of 300 year old old cedar trees to make a shingle roof that will last only 20 years?
3. If you want maximum convenience and hygiene, plastic is a good way to go. It is a good choice for heavy cutting that might mar the appearance of your "nice" cutting boards. I also make a small cutting serving boards made from exotic woods and I recommend they be used for light duty jobs such as slicing cold cuts or cheeses. With this siort of light duty use and hand washing the board retains its nice appearance and oil finish for a long period of time.
I have no bias against bamboo but it is good to know what the facts are when evaluating choices