Selling books to Pele Mele or Nijinski - prices?

I've often seen messages here about how Pele Mele pays "peanuts" or "very little" for English language paperbacks, and Nijinski pays a bit better.

Would anyone happen to have more detailed info on what they might pay? I have loads of English-language crime fiction paperbacks. From the last couple of years; cover price between 6.99 and 8.99 pounds.

What could I reasonably expect? 50 cents per book? More? Less?