They're not really offered for sale that much. Most captive-born litters are accidental and the owners are happy simply to find homes for the offspring. While there is some demand in Canada for water snakes, those few of us who work with them are reluctant to breed them because a single litter would easily saturate that small market.
Note also that Northern and Lake Erie Water Snakes are protected in Ontario.
Water snakes <em>are</em> around, though; I believe Grant's had a few in his store from time to time, or has ordered some in. It's just a matter of keeping your ear to the ground and jumping on whatever opportunities arise.
Also, in my experience, several water snake species (I've observed this with <i>fasciata</i> and <i>sipedon</i>) are relatively easy to convert to a mouse-based diet. I know of one <i>clarkii</i> that was pretty stubborn, though.
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