I've just found out today that Adoramapix stopped offering Ilford Multigrade Express RC as an option a few months ago. Guess I should print more often. I spent some time today looking around for another printer that uses this paper, so far I've come up with Mpix.com, Fromex.com, and digitalsilverimaging.com.
I ordered some prints from Mpix today, even though they only carry matte finish and I'd really prefer glossy. I talked to Mpix customer service and they just have one machine dedicated to black and white, so no prospect of getting glossy paper in the future. At least they're fast. I already got the confirmation email that my order has shipped.
I'll probably try Digital Silver Imaging next. They've got their own printing application you install, and that seems interesting.