If everyone who is interested in getting notified when there is a new promotion, simply subscribe to this thread.
Then, whenever someone finds a PM promo, or even a change in the plan offerings (not all are announced), simply come and post it here (bookmark this post for easy reference). If you include a link to the announcement, that would be even better.
This way everyone subscribed will get notified (make sure your e-mail notifications option in your profile is turned on).
The more people subscribe and participate, the more eyes there will be involved and the easier it will become.
Spread the word around to help make this work...
Also consider doing the same thing on a more public forum, here: