After walking around in Uyuni for a little bit looking for a place to stay, we ran into someone we met in Salta, Argentina who gave us a good reccomendation of a hostel to stay in. We were relieved to be back paying $3 or $4 USD a night as opposed to the $20 - $25 USD we were running into in Chile (Chile is an expensive place to travel).  We went for a drink and then booked a one day tour in the Salt Flats which are supposedly the biggest and most amazing in the world.   We worked out a deal with the agency that we could watch the sun set on the salt flats and then return after that instead of staying at the touristy hotel in the middle of the flats that charged $50 a night to stay. We got some great photos on the flats, because they go for so long and flat you can have some fun taking some optical illusion photos.