wow i haven't seen a choker since the 90's. if you dont mind beads, try the stands at the mall that sell necklaces sometimes they'll have chokers that stretch but must come with some sort of bead design.
Ahh, the good ol' times... you can find those all over the internet, such as eBay.. I haven't seen them in stores for some time..
theres a store called PIPS i dont know if they are local or not but they have all odd and random things like that
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also ebay & amazon have them.