I've been meaning to post this question for about a week now, but my internet isn't being too cooperative lately. How rare are Gillette Thin blades? I have about 10 or so that I got with my British New a few weeks ago, and I'm afraid to try them for fear that I won't be able to get any more! Now, the ones I have look brand new, unused but I won't use them if it's darn near impossible to get replacements (if I even like them).