Delmarva told me early fall last year they weren't handling YP or SMB anymore. Don't know if that was a short term deal or what but Skip did tell me he was out-sourcing the SMB when he could get a hold of them.
I do know of a strong strain of YP I'm learning more about as we speak but the logistics of getting any to you would be impossible at this point. I have a gent in Nebraska and 1 in Ohio that are going to be trying this strain eventually and maybe we'll know more this fall on how that's all going to work out.
Wherever you get your fish, it's usually best to source fish from a very similar climate.