When a deal has been expired, for example when it becomes out-of-stock, there is the temptation to post it as a new deal when stock levels return.
The positive aspect to this is that it brings the deal to the attention of people who mostly browse for deals via the new and hot tabs.
However, the OP doesn't get any recognition and HUKD ends up with multiple threads on the same topic.
The alternative is to add a new post to the end of an old thread. However, the only way of the thread coming to your attention (other than via a search) is to browse the "discussed" threads. This isn't very effective either as, if there are many conversations occurring in hot and new threads, the post can become buried.
My suggestion is to have a "resurrect" function. This could be performed on any old thread, expired or not. If it was expired, resurrecting would un-expire the thread. Couple this with a "resurrected" tab, which shows the resurrected threads (with most recently resurrected at the top) and HUKD would have a mechanism of bringing old threads to the attention of members, whilst recognising the OP and without the creation and policing of duplicates.
I don't know whether this is technically feasible with your current forum framework, but I think this could substantially improve the HUKD experience.
All the best,