led-dna sells 2 leds for 4.20$ - http://www.ebay.com/itm/2PCS-5mm-365nm-Ultra-Violet-UV-LED-Lamp-/390294985638 , or one complete keychain light for ~4$ (including shipment) at lck-led - http://www.lck-led.com/p845/Mini-KeyChain-Flashlight-w/-5mm-365nm-UV-Led/product_info.html.