Yes, it is very normal for a supplier to change up everything on you with no notice at all.  It is annoying for sure, but trust me, they are not doing it to only you.  A lot of places wait for the new year to introduce new product lines and get rid of the old ones.  The price change is normal as well.  It can be a pain the rear to have to go back and change all the product info, but the supplier company is not just being mean to you only.

I just had to go through with changing an entire product line pricing a couple months back, but the good news, it was because of getting better prices.  Ask yourself this - Would you be complaining if you had to change prices for the better?  Probabaly not!

This can get frustrating if you are just building a brand new site, and have gone through hours of adding in a product line.  This is just an example of bad timing when it comes to working with a supplier and building up your product line within your website.  

Staying up to date with all the current dropshipping product line and pricing will be beneficial for you in the long run even though it may seem like a pain in the you know where, short term.