Michael Stone's Neurodynamic breathwork is sort of a hybrid of holotropic (he learned from Dr. Grof). He's based out of LA I think. It's a shorter version and can be done at home online. Here's the link: breathworkonline.com
I've tried it a few times, I like it...just prefer it in person!
I've also tried Shamanic (Linda Starr Wolf) that I really like!
Thanks! Maybe we'll connect at a BW event sometime, somewhere!