At our childbirth/baby care classes this weekend our teacher brought birthing balls (same as pilates/exercise balls) for all the mommies-to-be to sit on. Let me tell you, I ran right out and bought one after class! It was amazing! It helped my posture, while not irritating my (ahem) hemroids like sitting on a hard chair does, and it also has tons of pre-birth baby-positioning benefits. We practiced all our breathing and relaxation techniques on it and the teacher also mentioned that after baby is born it's awesome for soothing baby- just hold them and bounce on the ball gently. Mine was less than $20 and I think it may be the best pregnancy investment to date. Just had to spread the joy if anyone like me had never heard of it! Do yourself a favor and get one ASAP!