Sanofi Aventis not supplying pens for their insulin cartridges..

I am a diabetic patient who uses Apidra and Optisulin insulin cartridges. I am in need of a new pen, but for more than 6 months I have not been able to get one. I have been to multiple pharmacies, but to no avail. How can a big pharma like Sanofi Aventis supply the cartridges, but not supply the administring tool. Please can someone from the pharma company please let me know where I can obtain the pens.