I found these nail stickers in Claire’s, they were £3.50 each, and as you can see there is a range of packets. I bought one of each to see how I got on with them.
I am currently wearing Midnight by Technic, and applied some stickers. They look so nice and professional. You do have to be very careful when peeling them off as they can fold so if you bend the plastic they are on like a U shape and get the sticker right by the edge and peel it off it is much easier. I had no trouble applying them with my fingers but they are a little fiddly, so maybe tweezers might be a better option.
I love these and will try to keep them as long as I can and reuse them if possible, not a bad purchase at all!