This is a product with an option of pack size. The 6 pack option is larger, so has an additional cost.
The "Single Glass" option currently has no stock available, so is clearly marked as sold out and can't be purchased at this time, however as the "back in stock alert" feature is enabled, customers can register their email address to be notified when it becomes available again.
Photo credit: Nathan Dumlao, Tyler Nix, via Unsplash
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