For a comparatively slow writer like me, trying to make a little extra on reprints is a really good idea. I more or less stumbled on the fact that Cricket Magazine takes reprints, and so I tried them with a young adult fantasy story I had published in an anthology. After many, many months--in fact, so many I had forgotten all about the submission--they bought the story, to be published in two segments this fall. My collection Absalom's Mother & Other Stories is mostly reprints, and has done nicely. Also this fall, an omnibus edition of my first trilogy will be reprinted by Fairwood Press. This is all great, but I've just learned from the fantasy writer Douglas Smith that I can do better.
On his excellent website there is extensive information about reselling short work to foreign markets: http://www.smithwriter.com/FML_article He even links to a list of those markets, and gives solid advice about how to submit to them. As he says, reprints are "found money", because you don't have to write a new story. Some foreign markets, like domestic ones, pay only in contributor copies, but not all. Douglas says, "Yes, you will generally get less for these reprints than for selling first rights in an English market, but remember that you can sell your reprints in multiple countries and languages. My foreign language sales have ranged from $20 to $200, averaging about $100 per sale – so you can easily pick up another few hundred dollars per story."
Many thanks to another author for generously sharing his knowledge! We're all in this together.