Looks like you've copy pasted your error into nearly every single shop. Make sure there is a closing " in case 3 of every shop. Specifically lines 176, 189, 202, 215, 228, 241, 255, 268, 281, and 294.
Please check out the free text editor
Notepad++! It comes with syntax highlighting meant for coding so it's EASY to spot syntax errors because the colors coded system of how it displays lines will jam up. Lines are also numbered.
All I literally had to do was copy paste your code into my text editor and the errors were all just sitting there, very easy to spot. Definitely look into getting a program to program in if you're going to be modding your site so heavily.