售完即止

while stocks last / subject to availability

to sell / to make or carry out (a plan or intrigue etc)

to sell out

to finish / to be over / whole / complete / entire

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

to stop / to prohibit / until / only