ISO: caterpillar enclosure

hi!! this might be a long shot but i have some swallowtail caterpillars on my backyard parsley and want to give them their best shot at becoming beautiful swallowtail butterflies!!

the only place i’m finding them is amazon and i’m trying not to give them any money lol

if you happen to have something like this or know of any places in the city that carry them please let me know!!😊