Looking at all these bargain prices makes my mouth water, but unfortunately there are no chances of finding tarot decks at second-hand bookstores or garage sales around here. The few alternative stores we have only offer a minimal selection of decks and they're usually the most common ones around. Regular bookstores sell those same decks, only at a much higher price.
I got the Medieval Enchantment(Nigel Jackson) for $28 and the Australian Animal Tarot for $20, but that's about the closest you'll get to a cheap deck here in Norway.
I also stumbled across Jewels of the Lotus: Tibetan Gemstone Oracle for $50, which may or may not be a bargain....have seen it go for much higher prices than that though.