Is there any way to sort out all the expired deals? 

When your looking at the deal listings, look to your right hand screen and scroll down a bit. There you will see a drop down menu selection for "Expired"/ Choose to make the setting "Hide", and that will literally hide all expired deals from viewing for you. Outside of that, until we a re notified by a user via flag, and/or we notice it ourself, past offers don't get auto-expired unless they have an expiration date attached to them. This is why the red deal warning appears on many past offers, if you click to view them, without an expiration date, as most offer last no more than 2 weeks on average. However, we don't want all offers to auto expire after 14 days, because many times this is not the case.

ginnysingh80, there is a difference between discussion topics and deals shared on Buxr.

Topics: http://www.buxr.com/discuss
Deals: http://www.buxr.com/deals

Since you just commented on several recently expired topics, I believe in your question you refer to deals posted as topics. The answer to your question is 'no', there is no way to filter out expired deals posted as discussion topics.

This is precisely the reason why we ask everyone to post these as deals. The deals page is specifically designed for deals/coupons/freebies and provides many ways to slice the data at your convenience (e.g. by expiration, store, category, votes, etc).