If you would like to start bento-ing for lunch and are frustrated paying high prices on ebay or trying to find bentos, I have seen them popping up recently at Asian stores! Along with the bentos, I've seen lots of accessories, such as sauce bottles, picks and mayo cups.
Hana Gifts (right next to Tensuke)
Koyama Shoten 5857 Sawmill Road (NW side)
Columbus Asian Market 817 Bethel Road (NW side, in the Olentangy shopping center)