As an old user you've fallen foul of the rules changes. The official options are to make 20 posts over the next 2 weeks or buy Platinum membership, but there seems to be an issue with the upgrade at the moment. @admin might be nice and do a tweak, but do be wary of looking like you're bypassing the rules - especially as you have something desirable there.
I was going to refer you to a certain Facebook group, but I notice that you're selling a Snickers bar there (Either that or the market just got flooded with Crossmans)!!!!!