Having been playing for a long time adult baby fantasies involving seating in a stroller and knowing how hard or expensive it is to get one that adults will fit in, I just want to let you know that if you are a relatively small adult like me 5'6" and 140 lbs. you can easily fit in a very popular baby stroller made by Maclaren and called XLR.
You can find them used on Ebay or Craigslist for about $100.
I have one and I love it.
it is the real thing :-)
This is my first post in the forum and thought of offering some help to those that have similar fantasies.