Syracuse is the only place I've seen that has the tubed sheep casings. It's not a 100 yard continuous casing, but a group of shorter casings each loaded on a tube to facilitate easy loading on a stuffing horn. Also there is no reason you can't cut a tube in half giving you 2 shorter sets. I've done that several times with their tubed hog casings. Go with tubed casings and you will not regret it, especially with sheep casings which are generally more difficult to handle (the standard bulk pack type are more difficult).
And Boykjo is right, Syracuse casings is top shelf stuff where LEM, DeWied and home pack are just no comparison in quality IMO. I remember way back when I started making sausage and my first natural casings were from LEM from a local sporting goods store. The quality does not compare to the stuff you find on tubes (even tubes from other companies than Syracuse Casing). Once you try tubed you will never go back if you have a choice.
I have a local butcher who buys from them in bulk and I pick mine up from him in 1 or 2 tube lots. He gets a shipment every week and I know what I'm using is fresh. The reason I say this is I'm not sure how many tubes are in a 100 yard hank. I would recommend you call Syracuse Casing and ask. I'm sure they would be more than happy to tell you that info.
An alternative is do what I did. Call around and see if there is a local butcher, grocery meat counter, or other store who will sell small quantities out of their bulk purchases. It may be a little more on a per tube basis, but I know it's fresh and I don't have to worry about not using an entire hank up before it "expires" (Syracuse Casing says you can store their casings for up to 6 months, so it depends on how much sausage you make as to how fast you will use it). My local guy will sell as small as a single tube. Call around and you might get lucky.
