Bump.
Done.
A reply to a post is a bump. The 2 bump limit is really only when you specifically want to "bump" to the top of what's new for visibility. When others reply to your thread, they are also "bumping" you to the top of what's new.
If I don't have any Pmags for sale, can I sell my one listing? Maybe someone didn't list all their mags the first time around. I'll be reasonable. I may even consider just asking for a share of the profit. Standing by...