About once a month I get a call asking for straight pull spokes. Sapim CX-Ray straight pulls are available for special order but otherwise I don’t offer them. Demand is low so I prefer to use available space and money for more popular selections.
You may be tempted by great deals on straight pull hubs but I recommend against them. Straight pull spokes make wheelbuilding more difficult because they lack elbows, which resist twist. And if you need a replacement spoke in a pinch, straight pull can make the search frustrating. Choose J-bend.