One can also order the Neotechs online at Amazon.ca and eBay Canada... but besides the fact that I never found them as comfy and supportive as quality leather straps, this would be a reason why I would just avoid Neoprene overall for any serious long term use.
I've recently been "reunited" with my old Scandalli accordion that used to be mine when I was 8 to13 years old (
full story here), and what I have decided to do is upgrade to 5" Italian leather straps for the Hohner Morino, move it's 4" leather Morino straps to the Imperator and move the 3.5" leather straps to the Imperator and move my velvet 3.5" of the Imperator to my just returned Scandalli Brevette (the dance of the shoulder straps... lol)
The current straps on the Brevette I will be returning to my aunt, they are 2" wide leather/cloth with Edelweiss flower designs on them... totally not my style.
As far as where I will be getting my straps from, I would only consider 2 places, honestly... Anderson's Accordions or from our very own Jim D. here via Falcetti Music in Springfield MA. Keith Anderson will get first crack as he is closer in Canada, but if he cannot find what I want (I am thinking 5" elephant straps this time for the Morino!), I am sure Jim D. would be able to help.