I buy the ones I like and are different then the norm.

I do not have the names of these small leaf cultivars but have been saving them from year to year by rooting cuttings iin September.  I pot them up once the show root formation (I root them in water and check every few days) then pot them up for bringing in for the winter.  I keep them alive under grow lights in the basement. I water them just enough to keep them alive until early April, then start to water them more often to encourage growth.  By mid May I bring them outdoors to harden off in a sheltered shaded area.  It this point I start to take cuttings to root in water to start the whole cycle again.

Heres another of the above photo:

This one is another of my favorites:

Heres some seedlings of big leaf ones i start each year:

..and some more.  I do not save the big leaf types: