My understanding is that you need both a Mr and a Mrs to get berries. Now my garden center down here only has "Southern Gentleman" winterberry!!! I have been waiting hoping they will get in the females too so I can buy one of each. I live near Philly so it would be a long trip for you to come down here and visa versa! Sometimes even the big box stores get winterberries in. Have you checked everywhere?
Joann

You need a male and a female. I have the straight species, Ilex verticillata. Link below is to their site where you can mail-order them.

Here is a link that might be useful: Musserforests.com

Not only do you need a male but you must make sure its one that blooms at the same time as your females.

For instance I have Red Sprite and the male is Jim Dandy. I know that the pollinator for Winter Red is Southern Gentleman.

I am not familiar with Jolly Red so have no idea which male would do.