Just idly wondering if there's a sub-based high-res service.

B&W's society of sound perhaps may give something close to what you are looking for. I don't use it, but my friend who is a user keeps on talking about it.

Hmmm. I might give it a try. Any others would be appreciated.

Yeah, I've been a fan of it for a couple years. Interesting they've released 1-2 albums a month, until last month. Not sure if there is a change going on. Nice that about a year ago they've opened it up to downloading most previous albums. 24/48 though.

Know of no other service.

And what do you know? Two new albums yesterday -

London Symphony Orchestra: Mahler: Symphony No 6

Cara Dillon: Live at the Grand Opera House

Available as 16 or 24-bit FLAC and 16-bit ALAC.

You could just post a list and ask Jacob what to buy once a month.