This program only offers one lunch kit per household, but we know you might have more than one kiddo (or grownup) at home taking their lunch. You can always purchase more lunch kits like the one you received online.
Other options are as close as:
Your local grocery store - reuseable food storage containers (found in the same aisle as zip-top plastic bags)
Your local thrift store - reusable containers, bento boxes and other containers to take your lunch in