Here is a giant latex balloon than usually bursts at 82,000 feet elevation for $20.

https://www.sciplus.com/latex-weather-balloon-8-foot-diameter-48265-p?gclid=CjwKCAjwvuzkBRAhEiwA9E3FUqgXjIrrhmgCxJH6qGK5UvYL9zQ20RDeX3RJJpliLF7tsAumoZtNwRoCQWUQAvD_BwE