We've had the Mr. Bento since college, quite the splurge for us back then. It has served us well and stood up to numerous uses and washings. We found the Zojirushi Mini Bento the other day while surfing for toddler bento menu ideas. The size is perfect for toddler appetites.
The Mini Bento includes a stainless steel lunch jar with vacuum insulated main bowl (9.8 oz), 2 side bowls (6.7 oz each) and a pair of chopsticks with holder. It all fits into a handy and attractive bag. Each of the bowls is microwaveable. Get it here and elsewhere for about $39.
(bottom pic via The Tiffin Tin)