Travel: our team was one of 4 that sponsored a Memorial Day tournament for ages 8-12. For the 3 years I was treasurer of the travel team (read: "I took over the money handling") I saved all the proceeds from three tournaments that paid for all the players to go to Cooperstown for the week. After age 12, I don't remember fundraising. Just wrote checks.
One travel team that came along behind us sold BBQ. I bought a quart by preorder (Loved the preorder idea; pre-covid)
High School: Sold Christmas trees and wreathes. Casino night. 100 innings day. Monthly Bingo. We were expected to do $X of fundraising or pay the difference. One year I just wrote a check, but I did it reluctantly. One 3 month season I outlaid $2000 for public school baseball, which included a spring break baseball trip for 2. We parents didn't go.
College: We could pay to join a "supporting club" that included a dinner and a pullover. We "joined" one year then opted to just pay for the dinner the other 2 years.