I occasionally build a box and have been using Brusso JB-102 stop hinges on them. In the past, I purchased the hinges at Rockler and they were $31 and change. Yesterday, I went to Rockler to get a pair of hinges and the JB-102 hinges were $47.99. That's almost a $17 increase, over 50%. I found them at Hardware Source for $31.30 (but I had to pay shipping).
I thought maybe they were just mismarked on the shelf but I checked the web site and, yep, they're listed for $47.99.
Mike