When I pre-ordered the Modern Spellcaster's Tarot back in May, Amazon guaranteed the price, and they were (eventually) true to their word, but I had to nudge them to get shipment. They "encouraged" customers to cancel and reorder but I just waited them out to save the $10. That's the only retail pre-order I've done; the others have been via Kickstarter backing. If the pre-order price is under $20 I would do it again (I have free shipping), since most popular decks are over that when released. There's no charge until shipment, so there is really no risk, just frustration if it falls through.