I do this with the 1020 web trays in which annuals are often sold. They aren't as tall so they only work for short seedlings, but I like free! They are also handy for protecting places where you've direct-sown seeds in the garden by just pining them to the ground with landscape staples or bent pieces of wire hangers. I'll have to check if our Dollartree has some of the taller baskets, too.
