Thanks for the recs here and on Twitter, guys! Here’s a quick post of the most promising POD printing leads:
Doujinpress.com - Will print adult material, has good per-unit POD costs, quick response, uses 70# interior stock standard, which is nice, site says they only print B5 size books but not sure if they do other sizes. United States.
Marquise - Will print adult material, excellent per-unit POD costs (though this is offset by import fees), variety of interior and cover stocks available. Will print standard comic size (6.625” x 10.25”). Canada.
RA Comics Direct - Will not print adult material. Responsive & recommended by a few artists. Will print standard comic size. Not sure what per-unit costs are in runs over 300. Nice paper options available. United States. I’ll probably use these guys if/when I do a PG-rated side comic.
Keness.com - Will print adult material. Unsure which sizes available standard. Variety of interior paper weights and finishes available. Minimum run 100. United States. No experience with these guys but they responded quickly.
Anyway, I’m probably going to get Whisper Grass printed through Marquise. I used them for offset printing the TJ & Amal graphic novels (they used to be Transcontinental’s comics division) so I know they do good work. There’s a very slight language barrier (all automated responses/notifications are in French) but it hasn’t been a problem.
For future reference. Too bad I’ve already decided on a printer for my book (DriveThruComics) but they are a pretty good price for their quality. :)