I have not.
Those who have can give more detailed advice.
Most pollenation is migratory, hauling semi truck loads of bees all over the country. Especially to California for the almonds.
Sometimes you can find a local orchard that only wants a few hives. Or some gardeners that want one hive.
You need some kind of contract, both to prove ownership of the hives and to spell out the responsibilities of the person hiring the pollenation. They have to promise to notify you if they are going to spray so you can remove the bees. You need some realistic, but short timeline for such things. Also some timeline for moving the hives in. For pollenation of a particular crop the bees are usually not moved onto the place until the crop is starting to bloom. Otherwise the bees will already have found a source for nectar and will probably not abandon that source for the new one.
Take into account the work and cost of gas, moving the hives in and out. If you can't get a price that's worth the work, don't do it.