okay, is it just me or have junk items inflated lately?

used to be if you SW'd a junk item (rainbow dung, soggy old box, etc.) you'd have like, hundreds of shops with that item for 1np.
lately when i SW these items, the majority of them are in the 4-5 np range, fewer and fewer are going for 1np.
am i crazy, or has anyone else noticed this lately too?