Can anyone with expertise in Canon digital Rebel housings please advise what is available in low cost, entry level type housings?

I have a Nikon D70 in an Ikelite housing, and if I had a Rebel, this is what I would use.

http://www.ikelite.com/web_pages/2dslr_300d.html

Hi, welcome to Wetpixel. For a review of the Ikelite that Peter mentions, check here:

http://wetpixel.com/i.php/full/ikelite-300...-preproduction/

One of the biggest advantages of the Ikelite (beyond the price) is that it supports eTTL:

http://wetpixel.com/i.php/full/ikelite-300...ettl-converter/

You should check the Aquatica too, but it is a bit more expensive (the Aquatica costs about $1,550.00, whereas the Ikelite costs more or less $1,250.00). Here is a review:

http://wetpixel.com/i.php/full/aquatica-a300-housing-review/

I hope this helps,

Luiz