Need a nano to micro sim converter for Nexus 5

I didn't even think about it until I got my Nexus 5 today and discovered it used a micro sim not nano sim like my iPhone 5. I need my sim card to work in both phones just in case, so I can't request a brand new sim card. I tried amazon but most of the options take 20 business days to ship from Hong Kong. For those in the United States, do you know of a retailer were I could go pick a converter up? Thanks!