Walmart offers the Mediasonic HomeWorx Digital Converter Box, model no. HW180STB, for $19.99. (Amazon charges the same with free shipping for Prime members.) Opt for in-store pickup to avoid the $4.97 shipping charge. That's $4 under our mention from last July and the lowest price we've seen. (It's a current low by $15.) This box converts digital ATSC broadcast signals for use with older televisions and features an HDMI output.