I think what you're talking about is the Trunki Harley Ladybug Suitcase or something similar.
There are a bunch of retailers that sell that product (Amazon and eBay are the obvious ones), but the cheapest I found was at Preciouslittleone.com
As for finding someone to pull you on it, I'd recommend the dating app Tinder.
It shows you people based on your current location, and when you match up with someone, you get the chance to chat, arrange a date... Or just ask them if they will pull you around on a kids suitcase!