I don't know of any to buy, but I have a smartphone and use both lose it! and the Sparkpeople app (I use Lose it! to scan and transfer to Sparkpeople to get the points later in the day)
If you mean something like the Body Bugg - they've come down in price, and the purchase includes a 6 or 12 month subscription. But I believe you'll need to renew the subscription to keep using the device. Not sure if some of the other brands don't require a subscription. As you research, be sure and check for reviews/user feedback. Cheap products sometimes don't work so well.
If you mean for tracking calories eaten, if you have a Smart phone - there is a Spark People app for free.
Summer produce is overflowing--and cheap! Whether you grow it or buy it, it's easy to preserve your food so that you can save money and eat better long after the harvest is over.