Just an update: I did find them on JC Penney's website. Since I'd rather spend my money on more important things like fuel for my car and food, I wanted to see if I could "fix" it first.
I was all set to do it this afternoon, after all my shopping was done, when I realized that I don't have any Gorilla Glue in the house. I think I left it at Mom's for a repair that we still haven't done yet.
Okay, then we'll see what happens with tape.
I have double-sided tape, which I was going to use to hold the shade in place on the roller, and then use wide mailing tape and/or duct tape. I put the double-sided on the roller where the glue had been (it's still tacky), but struggled to get the edge of the shade to line up on the roller, so I moved the roller down a bit and then put the edge over. Only that didn't allow me to add the other tapes. So . . . I'm leaving it with just the double-sided, and *knock wood* it seems to be holding. It's back on my window and rolling up and down, so we'll see. Even if it works for a few more months, that'll be something.