You might, depending on age. I don't know when they started hep b as part of the childhood vaccination series, but younger TMs might have had it. My oldest is 12 and he got it as an infant, but I don't know how long before then they started giving them as a standard part of the childhood vaccines.
I found it interesting that they "identified me as a TM who might be more likely to come into contact" with blood, as I'm no more likely to be than I was last year or the year before, or at all really, but whatever. Having been in the Peace Corps, and seeing places where vaccines aren't common and the effects it has on people, I'm in the "vaccinate early, vaccinate often" camp so I'm glad to see them offering it to any who want it. Even if Target isn't your only job but you might be more likely to have exposure elsewhere, it's a great benefit if you can't get it otherwise.