Real UGGs vs Fake UGGs?

I have wanted genuine/REAL UGGs for a while and I do not want fake UGGs at all. For those of you who don't know, some bootleg UGG companies are making UGGs with a label on the heel that actually says UGG. My friend's skating club is selling pumas, coach shoes, and UGGs and for short (medium) UGGs it is $100 (Canadian) and for tall UGGs it is $120 (Canadian). She showed me the pictures she printed out from her computer and I don't know if they are real or not. She isn't the one selling or getting them and she wants a pair herself. I don't know if I would be able to see the UGGs in person or not. Can you guys tell me how to spot fake UGGs please? :] OH and do real UGGs come with tags on them when you first buy them (like suede tags too)? I would like it if someone has gotten real UGGs in store could tell me if they come with tags on them. Thanks a lot! :)