UPDATE – THIS DEAL IS NOW SOLD OUT I love Bento boxes for my kids’ lunches, but the one-piece good ones are usually fairly pricey. But today the Bentgo Kids lunch bento box is on Groupon for 50% off – $19.99 instead of $39.99. I checked CamelCamelCamel and it hasn’t gone this low on Amazon that I can see. These are…