http://www.gallito.com.uy/inmuebles
try this website, its in spanish, but easy to figure it out.
on your left you have either "apartamentos" (apartments), or "casas" (houses), etc...and further down you can choose which city "departamento", or even which neighbourhood (barrio).
this is the website that most uruguayans go to look for cars, houses, jobs, etc.
hope this helps.
Jessica