I have a LOT of old necks because I use Whiting 100 Packs & Saddles for just about everything. I literally have 100's of 100 Packs because I was buying them before the hair fad when they were often times selling for $10 or less.
In regards to necks, if I handed you top grade necks from my collection from Grade A Chinese or India necks, (pretty much all we had to work with eons ago) through some of the first genetic necks, into Metz Grade 1 from the late 1980's into the early 1990's to today's Whiting Gold or Platinum; you would be amazed at the difference in quality.
I had the pleasure of talking to Bucky Metz some years back and Harry Darbee a LONG time ago about the early days of genetic hackle breeding. It is amazing the strides that have been made and keep being made in genetic hackle.
While I don't buy necks any longer because I never use half of the sizes on one, I wouldn't hesitate to buy a Metz neck if I was shopping. Metz also leaves the shoulder & spade hackle on the cape so you get more usable feathers than you would on a trimmed neck from other hackle breeders.
BTW - Bill Skilton peddles saddle hackle on eBay. I don't know anything about it but I trust Bill so I imagine you can get some decent feathers on the cheap.