I just ordered some off of Etsy along with more sliders and square rings for the purse. They were cheaper than others I have seen online and after emailing back and forth with the etsy person I'm hoping that I'm getting something not as strong. I ordered 14mm ones - I thought the slim ones would be weaker but he said that the slims are actually stronger magnets so I went with the one he suggested... A few of my friends want to make the bag so I'll be able to go through those magnetic snaps and sliders and whatnot pretty quickly :)