We're visiting 2/18-22. Playing around with dates, I could only get the APH rate at RPR ($275/night for a standard room) from 2/18-21. (If I put in 2/18-22, I'm only offered club rooms or suites, and if I just look for 2/21-22, only the suites). So what we decided to do is stay 3 nights at RPR, and then for our last night, move next door to Sapphire Falls (standard room at APH rate of $169/night). We'll still be able to use Unlimited Express Pass all day on 2/21 (as it's good for your entire check-out day), and we fly out so early on 2/22 that we wouldn't be able to use it then, anyway. We travel pretty light, so having to pack up and have our bags moved won't be a huge deal -- although I will keep my eyes peeled and see if APH rates for standard rooms at RPR come out for 2/21, in which case we'll stay there all 4 nights. I'm sure it can happen. When the APH rates were first released, there were none for RPR except for suites... after a few days 2/19 and 2/20 had standard rooms at RPR at APH rates, but not my arrival or departure days... and then a couple of weeks later, when 2/18 also became available, that's when I booked.
Moral of the story: be patient and keep checking. When I found the standard room APH rate at RPR, it was because I couldn't sleep and was playing around with my phone at 3am. The same rate hadn't been there when I'd checked that afternoon at work around 5pm, so you never know when the rates will update...
In the meantime, I know it's not the hotel you want, but if you want a placeholder reservation for your dates, Portofino Bay currently has deluxe (extra-large - like 1 1/2 times the size of a standard room at RPR) rooms for an APH rate of $404/night from 2/16-19.