I have only gotten my needles through a prescription from my vet, but was wondering if there is a cheaper option. Someone pointed me to a link but the needles said 5/16 inch and mine are 1/2. Is that just the length of the actual needle I stick Dale with? Does that matter? If possible, I'd like needles with half-unit measurements as I am dropping Dale's dose. The needles I currently have are: BD Ultrafine. Capacity: 3/10 ml cc, length 12.7 mm (1/2"), gauge 30G. I want to make sure to get the right ones because one time the vet accidentally gave me some where the unit measurements were totally different. Thanks everyone. I'm fairly new to this board and it has been great!