I forgot to report that last week I had my first store-bought bento! I was shopping at One World Market in Indianapolis, and they have a grocery section and a dine-in section (the employees greet you when you walk in the door, just like at Japanese restaurants, so I've read). I had to run after I shopped, so grabbed a bento on my way out.
I got a kara-age chicken bento: half of it was filled with rice sprinkled with black sesame, one corner with kara-age, one corner with potato salad. There was a slice of tamagoyaki (much sweeter than what I make, but I liked it that way), a slice of crab, and a few of cucumber and takuan and (one of the reasons I bought the bento was because I wanted to try that before I bought a big piece). It was delicious, better than I was expecting: good flavoring with the kara-age and crispy breading, slightly-sweet and stringy potato salad, and fresh rice.
If I'd had my camera with me, I'd have taken a picture, but I didn't, unfortunately. You can find a picture of the same bento here, though, along with other pictures of the place!