Coupons come out regularly. If you aren't seeing newsletters or don't know if you have the latest one you could look here : https://www.renderosity.com/mod/emarket/index.php

Not ideal but I had to do that for several months last year when I wasn't getting them.

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo