If any of your currants are under patent, then this would present a problem, but if not, they are very easy to propagate. I cut greenwood pieces this time of year, strip all but the topmost leaves and stick em in the ground with a Myko Pak (or your favorite fungus inoculant.) They root pretty quickly.
I have also planted dormant cuttings - about 8-11 inches is plenty - in ground with Myko Pak in fall before the ground freezes. Leave a couple buds above the soil and lay mulch over 'em and watch 'em grow next season.