This app was mentioned in 3 comments, with an average of 1.67 upvotes
There is an android version that could allow you to do it easier (via phone) rather than having to have pen and paper everywhere. its available here: https://play.google.com/store/apps/details?id=com.hatefitech.childfreebingo&hl=lt
FYI for those of us who would rather not carry around a paper and writing instrument- there is a childfree bingo card app! I'm not sure if it's on iOS but there is definitely one in the Google Play Store
Edit: link
Yes! Check it out!