The Green Showers appears to be hard to find on-line. There are one or two US wholesale nurseries that list it but no retail ones that I could find. Looking at your zone - 2b- are you wanting to grow it for yourself? Boston Ivy is usually listed as hardy to zone 5 (sometimes zone 4...) so it'd be a bit risky for you. Virginia Creeper (Parthenocissus quinquefolia 'Engelmanii') is the one I see listed as hardy to zone 2....
Do you have a local nursery who is prepared to custom order things for you? When you're looking for hard-to-find stuff, it's often best to have a nursery order for you as they have access to wholesale suppliers. I buy a lot of my plants at one nursery just because they're willing to custom order for me whenever I want something they don't usually carry.
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