In the US, you really cannot, generally speaking, get a room for under 30 USD a night and in most cases, nearly all of them are around 40 USD a night. However, though, there are exceptions. For instance, I've seen rooms in the tourist traps of Las Vegas and Miami to have some rooms hovering around 20 USD a night. I suppose the reason is that there is so much competition there that certain owners have to give rock-bottom prices. Anyway, I'm always assuming people are looking online for deals, and that's where I found out about these incredibly cheap prices.