@Joshua
You’d have to find third party sellers which offer them for more or less the same prices, whether it’s on eBay/Amazon or another site or someone selling official merch at cons (there were plenty of RDs and probably Princess Twilights at my local BABSCon two weeks ago for instance, but that’s a special case).
4DE probably sent any future stock to other distributors/retailers (even cheaper than the list price in some cases), like Entertainment Earth (only see Derpy, Twilight, Whooves, and Fluttershy) where I got my Whooves plush, or third party sellers on Amazon. I’ve also seen them at conventions where in some cases they’re sold for less than the list price (my Twilight from BronyCon 2015 being maybe $12 if I recall correctly).