Good morning!

Does anyone know where one can find a clear, accordion foldable, stage size sleeve holder? This would be what Blake Vogt sells on his website for stage, except I don’t need it to be gimmicked. This is for a gag/joke moment, where I turn around on stage and purposely “unintentionally” show the writing on the back of large index cards.

I reached out to Blake Vogt via his website contact page, asking if I could just purchase a sleeve from him, but haven’t gotten a response. I have Googled this, but can only find wallet sized clear accordion foldable sleeve holders.