I agree @pinthrift that the Cable Company is good way to demo different cables.
Sorry, but I disagree unless you can’t find the cable you’re looking for on the used market. The discount on used cables is 50% or more, they cost very little to ship, and if they don’t work out just sell them for little/no loss and you can try as many as you like this way. In this regard paying The Cable Company to try different cables and then pay full price for cables is kinda nuts, again unless you’re looking for something that’s just not available on the used market. Then there are several excellent cable companies that sell direct and offer excellent quality and value and generous trial periods to see if they work in your system. Just my $0.02 FWIW.