If you don't mind a curfew and a little peace and quiet, you can bunk at a monastery for as little as $18 to $35 a night, says Pauline Frommer of the Pauline Frommer Travel Guides. Generally you'll find convent or monastery stays in France, Spain or other Catholic countries in South America. You'll also find religious retreat houses of all denominations throughout the US where you can get find affordable rates, according to Frommer. To get the lowdown on where to find these places, check out guidebooks that focus specifically on convent or monastic travel or ask about accommodations at the Vatican Tourist Information Bureau. Keep in mind that there may be gender restrictions and if you're traveling as a couple, you may have to get separate rooms