I have always used a surgical scalpel for a seam ripper. A friend's mother "appropriated" some for me and I was hooked. I became so used to treating myself to a fresh one whenever I felt like it that when the supply ran dry I searched on the internet and lo and behold there they were on eBay. I bought a dozen pack of disposables a few years ago but I might splurge on a handle and replaceable blades next time. Just look for craft or hobby or non-sterilized scalpels. They're there, I just hope I haven't dried up my supply by letting out my secret :oops: