Hi 
I am having a need to create a free site(atleast for now) that would
allow customers to post their requests and sellers to respond to their
request with what they have to offer.
i would like to find out if there are any pre built systems/softwares
that does this that i can buy or customize.
I would like it to have features so that customers can register for
free.
sellers pay a subscription to view the leads(which i should be able to
toggle on/off)
My plan is to offer access to everything in the site for free and
later
restrict customers to three free offers and block the rest. only paid
members can recieve unlimited offers. likewise for sellers. initially
they will get free trial and then they have to subscribe to continue
Please advice