Yes, I've heard G&H Dark Birdseye & Kendall Dark are good. But strong! Not for the faint of heart. Not sure which SG ones are shag, I'd love to know. And Five Brothers by Pinkerton.
D&R's Three Sails is totally a mild VA shag, and also to some extent their Ryback, which is a little stronger, like the Dutch RYOs you are probably familiar with. But these are really RYO's, not pipe baccies. There are guhzillions of RYO's out there fraudulently labelling themselves as pipe baccies, but most not proper fine shag like Drum or Samson, if that's what you say you're looking for, and it should really be a proper pipe baccie, not an RYO.
There's always Prince Albert--not exactly a shag, its moniker of "crimp cut" is unique, but rolls up fine just like a shag, makes a great cigarette.