There are so many ultramodern stores right across the square from the Cathedral.
It's very easy to get lost in them.
What I found good was a number of kiosks where you can have a snack; a large number of nenches around Market Square where you can relax having a snack...
What to buy: clothes, gufts, food and drink.
What to pay: 50-100 Euro
This market is just great, was very tempting to try some of the local delicious items, for example, there were many kind of sandwiches to choose from and I did not knew what to choose, in the end I had the regular bratwurst, but I think I should have try some local original item, if they had any, maybe the next time.
What to buy: Something to eat
What to buy: Mainzer Handkaes! It is a special kind of cheese, well, not everyone likes it! You can get it also in the rstaurants as a local specialtiy: Handkaes or handkaes mit Musik (with onions) lol