Vimeo member Just Basl Productions gives us his opinion on the VF Prime LCD view finder. This is a 3" LCD View Finder, so it will crop a bit on a T2i, T3i, or Canon 60D if you choose to use it. It's not the cheapest LCD Viewfinder solution, but it's also not the most expensive. This one has received excellent reviews so far. The mount is the typical stick on plastic frame type, and optional frames can be purchased seperately.
You can find this under a few different names like 'VF Prime' or Seagull View Finder. Can be found on eBay here: VF Prime LCD View Finder for 3" Canon Nikon DSLR
Or also Available on Amazon here:
VF Prime DSLR Camera LCD Viewfinder for 3" LCD