The Agfa division that made consumer products, including paper, went out of business quite some time ago. Fortunately, a smaller company bought the rights to make some of their products and hired some of the expertise, and the first of their products -- resin-coated B&W papers -- is now back in production and available. If you're in the US, you can buy it from
Freestyle; in Europe, it can be purchased from
Fotoimpex. The new brand is Adox. Note that there are non-Agfa Adox products, but I'm not sure about the non-Agfa Adox paper lineup. Just look for something with the same product name (MCP 312 RC, in your case). The new product is
very new and isn't yet fully distributed, though; IIRC, it should be available later this month. There's currently a bit of old stock Agfa paper still available, some under the Adox name.