Castlevania Collection. I know it's not the cart, but at least it's an official way to play it.
Both the Anniversary and Advanced collection have been on the mind since I first heard about them. I prefer physical but I'm fine downloading digital depending on the context. Might snag a physical Limited Run release of the Anniversary Collection then download the Advance collection, assuming that doesn't get a physical release later. My Switch library is small at the moment, so it'll coincide nicely when I get Bayo 3 later this month.