The last solution is the one of choice, if you have the machines. But many people don't and that is why one alternative is to find a shop that will help you out. If you can find such a shop it may turn out to be very easy for you to show up now and then with a few boards and quickly have them planed down, so it's worth the effort to investigate by calling around. But keep the following in mind. These shops will be busy and it is not worth their while to disturb their normal flow of.