I have 15 ten packs and lot of single packs so I think I'm set for along while. All bought on great bargain prices. One sale was 75% off for ten pack package. And Tuesday Mornings had Olfa blades for $1.99 for two. I bought all they had. Clerk said they haven't been selling! Of course she didn't know what they were for. LOL I see the regular price of the blades now and I am so glad I stocked up when I found a sale.