Can you be specific?
If its the motel C-orgs not all girls partake doubles. That do have it listed at $300 iirc, which is actually a slight discount than 2 milfs separately (160+160). The ones I'm interested don't partake so I didn't dig deeper.
If its SH they seem to have left it ambiguous now that they list 4 girls, but if you know the girls sometimes they do have younger offerings and int he past its usually a young + a milf for $400 which seems like a deal. Intel on SH girls seems easier to get and the fact you can get one of them younger than a milf i'm willing to shell out the extra 100 compared to motel orgs.
If you're talking about the C-AAMPs listed via WS most of them haven't offered doubles in a while, the couple locations that do (particular the ones that have colombians) tend to be less reliable with pics and appointments. Sometimes you do get a gem (for the price point) like Valentina and supposedly Valentina + Karen double was offered, but I haven't heard anyone partaking. Couple months ago one of their more reliable locations did offer 2 college BFFs who dress alike but they're long gone now. Didn't see any English reports.