All these syringes have half unit markings (very important when you're doing microdosing) and are the correct syringes for U100 insulin and are available from ADW online: UtiCare Monoject Carepoint Sure Comfort B/D
They're also available at WalMart if you have one near you. Their Relion brand 3/10ml, 30 or 31 gauge, 6mm or 8mm insulin syringes all come with half unit markings and are only $12.58 for a box of 100 (although a lot of them don't realize they DO come with half unit markings!)