There is, and I meant to add it to the rules! >_< (I'll amend them tomorrow when I'm not so tired)
You'll still have only one day in the summer when you can sell things. The items have to have depreciated in value at least 50% before you can sell them! So things that previously weren't allowed to be placed on the lot, will have to be in order for them to depreciate (like items in the new spouse's inventory and crafted items). You might need to put them inside a fence so they can't be used! When summer rolls around, just sell the stuff using buy mode. But only if it's sufficiently depreciated, so you might have to make a small effort to keep track of the retail prices. :P
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You'll still have only one day in the summer when you can sell things. The items have to have depreciated in value at least 50% before you can sell them! So things that previously weren't allowed to be placed on the lot, will have to be in order for them to depreciate (like items in the new spouse's inventory and crafted items). You might need to put them inside a fence so they can't be used! When summer rolls around, just sell the stuff using buy mode. But only if it's sufficiently depreciated, so you might have to make a small effort to keep track of the retail prices. :P