After doing much DD, I came up with an order for 0-rings from a major distributor.
The industrial supplier is RT Dygert in the midwest. The shipping is the biggest cost, so if you need just the one computer size, it will cost $7 delivered for a pack of 100.
We have 4 Sherwood regulators and three octos and two diff computer sizes, so kits with 2 or 3 o-rings are useless.
SO, I put together a kit of 11 sizes with (6) pieces each patterned after the Sherwood rebuild kits, and incl extra sizes for common application like HP spool, tank yolks, etc.
I posted on eBay and eCrater for the nominal cost of $10 free shipping, under the title of ""Sherwood scuba 66pc 0-ring kit incl dive computer seals" and will soon be posted under Marketplace -misc/auctions. I compiled a lot of info in my listing from this thread for o-ring compatibility.
It amazes me what they are selling on eBay and no one has the -026 computer o-ring included (needed for CR2450 battery), not even the (200pc) $39 kits from Innovative Scuba Concepts (they do have -023).
I even found one amazing listing for 40 o-rings for $8.25 + $2.50 shipping BUT he doesn't list what sizes they are!!! Not only that, but he sold 28 of them..amazing
Appreciate any feedback on any recommendations/errors/omissions in my listing and hopefully this is a benefit to those with a need.