Sandhill Preservation Center keeps their single combed and rose combed white Dorkings together, so you would likely get a mix of both if you ordered from them. Here's a link to their poultry page -- the Dorkings are not in the alphabetical listing, they are in a separate category about 75-80% down the page:
http://www.sandhillpreservation.com/catalog/chickens.html
If you do decide to order from them, be sure that you read their ordering policy. This is not a standard hatchery. There is no customer service department, everything must be prepaid, and there is typically a long wait with no updates from the business, which infuriates some people. The quality of bird will not be as good as many private breeders, but they try their best and have many breeds that are very difficult to find anywhere else. It may or may not be too late to get Dorkings this time of year, as winter layers tend to stop laying during the summer. When I order from them, I typically order in September-October for the following year, and include some extra money to account for any price increases that may occur (because their catalog with prices won't be available for the following year at the time that I order). That gets my order in line early, and saves any extra back and forth getting payment to them. They have always refunded me whatever extra I've paid, typically in the fall when they have time to catch up on some bookkeeping. But they have a strict "first paid, first shipped, when/if it's available, we'll refund you at the end of the season if we couldn't fill your order, we're way too busy to answer every inquiry" kind of policy. I'm fine with it -- I appreciate the effort they make to keep rare breeds available, and recognize that it's impossible to improve the quality of your stock when you're working with over 100 different breeds. Only devoted breeders can substantially improve their breeding lines. But at least people can get a start with these birds, and then breed for improvement later.
