Need help getting all shop buttons to line up in Marketpress

Please go to:

http://69.89.30.241/dev/frenchietest/pet-supplies-shop/

The last thing I need to get fixed on this site before it goes live is getting the dang shopping cart buttons to all line up horizontally. Look at "croc hoodie" on the first page of the shop, then click next page, and look at "hipster denim collar", "K9 Koolee Portable Bed"...

Is there css I can add that will make all buttons line up correctly? I'm tearing my hair out over this, been trying a variety of things using the chrome inspector tool with no luck.

It seems to be an issue with items that have options not wanting to play nice. Hoping someone can help me figure it out soon!

Thanks guys.