Why is Reuben meat so rare?

I really like eating Reuben sandwiches but I can only get them a couple of times a year because they're always a limited edition deal. When I went to Subway and asked the guy earlier today he told me that they can only do it when they can get Reuben meat and that it is normally very rare and hard to find. He... show more I really like eating Reuben sandwiches but I can only get them a couple of times a year because they're always a limited edition deal. When I went to Subway and asked the guy earlier today he told me that they can only do it when they can get Reuben meat and that it is normally very rare and hard to find. He said that there are some specialty restaurants that sell Reuben sandwiches year-round but that the sandwiches are more expensive. But isn't Reuben cow? Beef is not hard to get so why is Reuben meat so rare?
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