You can go to Skeldale house and get the Free Rosary project (scroll to the bottom) Split the design so it only stitches the cross.
GNR has some for $2 or the whole set for $5
Have a look on the Criswell site. S014 Spring Charms is one set with fsl crosses and there are certainly others. Not free, not particularly cheap either, but will be well worth the money.
they have here, a time ago they were for free, but I don't think they still are.
and I thought there are in "designs by cuties"