I had been using natural hog casings that were purchased at one of our local sporting goods stores....I guess there are what you would call "seconds". Short bits and pieces packed in plastic bags. The last time I needed casings I couldn't find them in stock anywhere in my area. As luck would have it I ended up ordering a hank from The Sausage Maker's web site. I must say these are some impressive natural casings. Very long...in fact so long that I needed to snip them to create some manageable sized lengths. They also appear to be much fresher than the other crap that I was buying. Needless to say I will never skimp on casings again. It is such a pleasure to work with these casings that I almost enjoy the stuffing part!
If you haven't done so yet do yourself a favor and try some of these....You will not be sorry.