Valid.
Free to meet someone, speak on the telephone, enter a romantic relationship, or the like.
Readily obtainable.
Such as one may avail oneself of; capable of being used for the accomplishment of a purpose.
single; not in a committed romantic relationship or otherwise unavailable.
Offered for sale.
During a real estate auction: going to be sold at that auction, i.e. the bid has reached the vendor's reserve.