售完即止

售完即止	shòu wán jí zhǐ	while stocks last / subject to availability
售	shòu	(bound form) to sell; to retail / (literary) to carry out (a plan or intrigue etc)
售完	shòu wán	to sell out
完	wán	to finish / to be over / whole / complete / entire
即	jí	namely / that is / i.e. / prompt / at once / at present / even if / prompted (by the occasion) / to approach / to come into contact / to assume (office) / to draw near
止	zhǐ	to stop / to prohibit / until / only