I love these letter stickers by Making Memories and use them on practically every single project. I'm almost out and the big problem is I can't find them in stores or online anywhere! This isn't even the right picture of the exact product I love, they're that rare. Sooo... I made my own, for free, there's a ton more of each letter, AND, if I ever run out, I can just print more!
First, in Microsoft Word I typed the alphabet, one letter repeated per line. Then I copied the page into Adobe Illustrator and changed the font to Times New Roman. Next, I expanded all the letters so they became objects instead of letters and so I could move them around individually. Then I moved each letter up and down for a more ransom look. Finally, I printed the sheet on sticker paper. Now when I need a letter, I just cut it off my sheet. Genius! :)