I have to admit I've sat here for a long time trying to figure out what possible engineering application you'd have for those things. Can you give us a hint?
One such company is Dongguan Tangxia Sunjune Toys. They call 'em "Water Wiggles". Supposedly they do OEM work too - although perhaps not what you're after.
I couldn't find a website of their own. You'll have to contact them through a B2B site like Alibaba. See link below.