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Seemed fairly popular previously at $8.50 so here you go, back in stock and $1 cheaper than last time too.
(Despite Amazons RRP of $18, these are going for $10 around most stores.)
If you just want a black marker, can still get a single for $1.50
EDIT: Looks like they are back in stock, who knows for how long.
No option to add to cart. Sold out?