If you're ok with it being a touch oblong, you could buy 4 giant easter eggs and put two bottom halves together for each.

https://www.amazon.com/Giant-Transparent-Plastic-Easter-Inches/dp/B0843N9DJ4/ref=sr\_1\_3?crid=2YT53A9VH2SW1&dchild=1&keywords=giant+easter+egg&qid=1633458215&sprefix=giant+ea%2Caps%2C154&sr=8-3