Mina: I have a box of hundreds of 21 gauge lancets that I'm not going to use. They're 'expired', but I can't think of what can go wrong with a lancet. I can probably even scrounge a lancing device.
They're yours if you want them.
I use a preloaded, single use, lancing device for my tests. They're easier, you don't have to throw out (or store) used lancets, and they make the right size incision for an INR test. I got them on eBay. They're actually pretty easy to find on eBay -- just look for 21 gauge. You may even find them in listings for CoaguChek XS (or Coag-Sense).
I also have some that I'm not crazy about - probably around 100 or so -- they do the job, but sometimes can leave a small bruise.
If you want more information, or want the 21 gauge lancets, send me a private message, and we canwork things out.