I have no idea how nice a guy Sheldon and Barry are and I'm sure they are sincere. But I didn't make this stuff up!
Allow me to QUOTE THEIR OWN WEBSITE:
"Where can I buy strings for my Dingwall bass?"
"Please contact the nearest Dingwall Dealer for the purchase of Dingwall strings. Or if you prefer you may purchase strings directly from us in quantities of 5 or more sets in our online shop. As with buying basses direct, we charge the same amount as our dealers for strings."
FIRST CHOICE: Go away kid and bother a dealer!
SECOND CHOICE: Well if you MUST have strings for your bass you can get them from us if you buy 5 (OR MORE) sets at a time.
NOTE: We charge the same as dealers so no volume factory discounts.
And how do you define "numerous" So far I've only found Payson (on facebook with website under construction with some strings at least seeming to be "prototype") and supposedly Circle K. I don't know. They seem to make a zillion types of strings so I'm not surprised they also make Dingwall sets, but I couldn't find those sets in the listings on their website. Plus the stainless factory jobs, natch.
Obviously strings for Dingwalls are still a matter of double secret probation! It's great that the cognoscenti have found the place to push on the walls to find food and ammo (and Dingwall strings) but it's clearly not so easy nor widely available.
Here's my beef. Not so much with the Nice Guys Sheldon and Barry but with their website. I sincerely suggest that if a company is selling expensive basses that use weird string sets, it just might help sales if the website went out of it's way to solve the problem of replacement strings for the owners. Best would be to have the online store keep abreast of what's out there and allow you to buy them in the store. Next best might be links to places (known by Dingwall to be reputable) that have strings. In other words provide some support for owners and potential owners. Just saying stainless steel take 'em or leave 'em 5 sets at a time, is not what I'd call conducive to potential sales. In actual fact it KEPT me from buying a Dingwall.
But the assertion that Dingwall strings are "numerous" is about on the level of GC saying they stock "many" 6 string sets (They stock exactly ONE kind, (34") take it or leave it)
Have a nice day!