Not a similar size, so I can't help you with the measurements, but here:
Fused Neckband, soft lining, medium fusing
Might want to clarify as "medium fused neckband with soft unfused collar interlining".
You'll like that combo BTW.
I loathe Paypal. I can only hope that Bitcoin grows in popularity. Actually I think Shopify supports BTC payment so in theory Luxire could add Bitcoin support, but there is probably no demand for it right now.
When you check out it should give you additional payment options. I can't seem to find it right now in the general Paypal setup, but it should be there when you check out. It remembered my preference for all future transactions on that card.
A tip for those outside the US using Paypal for items priced in USD: If you set Paypal to charge your credit card in USD instead of using the Paypal conversion rate you usually get a much better rate from Visa/MC than you get from Paypal.
NOBD (the SF forum member) requested this collar style from Luxire early on and it kind of caught on. There is the NOBD I and NOBD II collars. See the collar spreadsheet linked in Luxire's signature for more collar options.
PS - all of my dress shirts are ordered with the NOBD II collar.