To Buy or Not to Buy?

I can't decide whether to get a Doppler or not. I've always been against them in the past because I was always afraid that I wouldn't be able to find the heartbeat, which happened to me several times at the OB office with R and become worried. This pregnancy, I'm thinking it would be fun for my kiddos to hear the heartbeat to get them more involved with this pregnancy. I'm just really on the fence on whether or not to get one. It may drive me crazy.