Open Marketplace "Buy Now" links in a new window

Currently, Buy Now (external products/affiliate links) open in the same window. That's not optimal, as people might want to but two products. Having them leave the site makes it more difficult.

I can't find an option to open those links in a new window (target _blank).

I'd hate to add a plug-in to resolve this, as this should be simple, and I'd think it's an obvious function that should have been included.

Did I just miss something somewhere?

Thanks in advance!