I did not find the prices had risen at all. As mentioned some of the tavernas have dropped their prices as far as I could tell.
If on a budget I don't think you could go far wrong by eating at Captains, Graziella, Vavallis. They are all very good and have daily special set menus, priced at 6-10 euros for usually 3 courses.
As far as drinks go beers 2-3 euros wine 5-9 euros (large jug) spirits/ cocktails 3-5 euros. Plus you can always have a tipple on your balcony bar!!!!!!!!
Pauline x