Frink's lab has definitely gone on sale. i don't remember the other examples. Every once in a while, Gil will appear in towns with a sale deal (it isn't random, it is always announced). Sometimes the deal is 25% off donut prices, but once or twice it has been a deal on specific premium items. I wouldn't say that you should count on it, but at the same time I would personally recommend waiting until the last week to buy premium Halloween items, in case they do go on sale (purely from a decorative standpoint; if you want ghosts, that is a different story).
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