i work at a blockbuster. you're best bet it to ask, but we no longer receive discs in their original cases. we underwent what's called rental repackaging and now distribution sends us the discs in out lockable amarays.

we used to throw away hundreds and hundreds of cases each week, but now we barely have enough leftover cases for our own purposes.

it doesn't hurt to ask the store if they have any extras. Maybe they stockpiled the old ones for years. My store used to throw them out each week. I don't know if it's different nationwide, but my store sold them at 5 for $1 i think.