It was a popular brand here for a few years, but really doesn't have a big presence lately. I know a lot of brewers like them do seasonal beers, but they seem to come out with some and then never or very rarely repeat them. Looked on their site and they didn't even show a distributor for OK, but I did see a place in Owasso called Kwenchers that listed Leinenkugel on their site.
Ive been trying to find a good photo of the Leinenkugel canoe hanging above the bar at McNellies downtown. Sort of flies in the face of a distributors comment that its not a beer Okies buy.
Breckenridge Brewery out of Colorado makes something similar, but absent some ingredients of the Snowdrift Porter. Close but no cigar.