One idea is to run a blog on buying cheap items and then using an RSS feed from Ebay to sell items at $7. The only problem with that though is that Ebay are pretty useless now since they dropped pay outs to be only by clicks.
I am doubtful regarding what you exactly need. Are you asking what to do with this domain? I think if you have booked this domain without any plan for a website and an idea, then the best way is to sell it. Because if you don't have the burning passion inside you about what are you going to host using that domain, then there are very few chances you would be successful, so sell it to someone who is excited about this domain.
I'd say sell things for $7 - not digital items - but things like stationary, gifts, etc. Like a dollar store.
care to specify what kind of suggestions? ssssaurabh is right, and i agree with him... if you dont have plan then its of no use...
I think this domain is useless, and can only go for a charity site... but personally I would have sold this domain. Instead of looking for a plan to a domain, look a domain for a plan
you can start a marketplace for items under $7.00, or use a promotional type website where you list 7 items for 7 dollars for 7 days. You have so many things you can do with it and you have a great domain name being only 4 characters.