Prices In Shopping Cart After "show Special" Price List Reverts To Standard

I offer "show special" discount pricing on certain products for a week following an event, utilizing a show specials price list for the week then reverting to our standard price list. If people place items in their cart but don't finish their order (pay) the items stay in their cart at the discounted price and don't seem to revert to the standard price list, defeating the purpose of the show specials only being valid for a week. Is there a way to correct that, other than manually charging them more for their order? 

Currently it stays in their cart with the previous price list. You would have to delete those existing shopping carts when the price list changes (Gallery -> Stats & Sales -> Click number of existing shopping carts).

I've made a note to look into this though.

That would be great, Tim. 

It seems rude to delete their carts but now it's awkward to not give them the show specials discounts that are meant to drive business sooner than later :)

JH