I've reworked some of the internals of the group buy widget. Previously, each daily deal didn't have a unique identifier from day to day, which meant that feed readers (such as Google Reader) had trouble updating daily entries because they weren't considered new. The net result was that the only new entry showing up would be Groupon (since it's directly pulled from their feed). Users would have to visit the Vancouver Group Buy feedburner page or Forum Vancouver manually to get an update on the other the daily deals.
I've since implemented a way for unique identifiers to be assigned so everything should work correctly.
Let me know if you run into any peculiarities. If this solution works out, I will be putting up email based subscriptions for the deals.