Walmart offers the Levana Alix Digital Audio Baby Monitor, model no. 32116, for $8.20. Choose in-store pickup to dodge the $4.97 shipping fee. That's $2 under our January mention and the lowest price we've seen. (It's a current low by $10. Most merchants charge $30 or more.) It features an 8-hour rechargeable battery, 1,000-foot range, and belt clip.