Synonyms and related words :
at a premium, beyond reach, closed forever to, closed to, impenetrable, impervious, in short supply, inaccessible, lost to, out of print, out of reach, out of season, out of stock, rare, scanty, scarce, sparse, un-come-at-able, unaccessible, unapproachable, unattainable, unavailable, uncommon, undiscoverable, ungettable, unobtainable, unprocurable, unreachable, unsecurable