I've found that some things are much less, some are much more, some are roughly equal. In particular, my meat bill has skyrocketed, but that's partly because I take advantage of the greater availability of free-range and organically fed meat. So it's my fault I'm paying a lot more.
Interestingly, since I came over here I've found myself "shopping the perimeter" of the grocery store a lot more often...veggies, meats, fish, and wine, with a short stop in the middle of the store for cheeses. The lack of Devil Dogs, Pop-Tarts and proper Doritos has really helped my food choices.
(On the other hand, the easy availability of decent wine in the supermarket has been a terrible temptation....)
Emily