What if you combine a bargain blog like this and social bookmarking service like del.icio.us? You get DealPlumber! From its about page:

dealplumber aims to address this problem (unable to find best deals across the web) by delivering a community-driven deals and coupons engine where you can simple search or browse for deals on product and services you might want, compare the different deals posted by different users and choose the best one.

It allows individuals to submit deals and/or coupon codes via its web interface (web service API coming soon they claimed). Deals can have optional URL and expiration date, and can be categorised with tagging/folksonomy. Other users can then search all these contributed deals, or list them by tags. You can also subscribe to RSS feed of all latest deals, or deals with a specific tag.

There’s also interactivity. You can rate a deal or give a comment. You can also subscribe to their weekly newsletter detailing the best deals.

It’s such a good idea!

However it seems to be pretty much US-specific. I tried to search “australia” and it returned nothing. Tagging is not really working as well. When you click on a tag, it does a search on that term instead, which returns undesirable result. Its database is still pretty empty, or at least I have not been able to find the deals I was looking for.

Maybe I’ll start tagging items with “australia” when it fixes all its bugs.