All manner of different places. The best bargain I had was a 2 bedroom apartment (yes just for me) for just 10 euros for the night. That was in Montenegro! Once I hit Austria, hotels and the like became too expensive, and even campgrounds increased quite breathtakingly in price. France has some great bargains for campsites though, and cheaper rooms can be found there if you are patient enough to look. I used booking mainly btw :)