I'm a little leery of the statement that...
...this horn is "...perfect for doubling clarinet parts in a big band...". Last that I checked, there aren't any saxophones which duplicate the range and timbre of the soprano clarinet.
But, I'm not an expert eBay seller, one who repeats the same thing in two adjacent paragraphs, so what do I know, right?
I do find tiresome both clarinet players who play sax parts on clarinet, and saxophone players who insist upon playing clarinet pars on saxophone. Almost invariably, they were written for one horn or the other for a very good reason.
(An exception may be made for baritone parts that, written in parallel with clarinet parts in the other sax chairs, were written that way due to the relative rarity of bass clarinets.)