The Ewa housing for the XL1 is about $900 (!). Some otehrs are jumping in, but the only one that is field tested, to my knowledge is the Ewa.(posted 8961 days ago)I am faciing the same trouble, and have decided to use a Sony TRV in an Ewa bag (about $250 street) underwater in an upcoming shoot in the Central Pacific. The change in "venue" to UW will hopefully mask the differences between the Sony and the Canon...
Rod Pyle