Most PWP nowadays are completer pins for previous hidden Mickey sets, one mystery pin per some-odd dollars spent (I believe $30). Currently you can also get a toddler Fab Five in attraction vehicles trading set for $20 if you spend $40 on other merch, but I don't know how much longer that promo will last.
For several years they had a themed set for the year and every month on a certain day you could get a PWP for that set. They did Tiki Room, Lion King, Snow White, Fab Five dressed as Haunted Mansion characters, etc. But they haven't done those for several years.
Most with-purchase deals they have are other merchandise, such a backpacks, tote bags, blankets, towels, and lithographs.