You are correct, current Academy Pro 23 Range was discontinued by Nike in December and has therefore been sold off in most places. Ref Stop cleared large quantities of Polos (and still are) at 22.95. They have a few jackets too but still full price.
If history repeats the previous few times, it will be the academy pro 24 range next season, which is already out, but of course we dont know for sure if the FA will choose it.
Ref Stop for some reason are usually privy to this info first, so keep an eye out on there for new lines coming in, but everyone will sell it (and much cheaper than them)