Bait and switch means you're lured in at one price and, when you get to the store, that item is unavailable but you're pressed to buy another item (the "switch"). You have not indicated that you were baited, nor have you described a "switch".

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Quote Quoting Quantity Limitations and Out of Stock Items
Quantity Limitations
If an item quantity cannot be increased in checkout or when adding to your cart, it's because there are limitations on how many of that item we can ship to you. Unfortunately, we cannot send more than the current limit.

Out of Stock Items
If an item is shown as "Out of Stock", it is currently unavailable but we are usually ordering more. Please visit the site periodically to see if an item is back in stock. Unfortunately, we are unable to estimate when an item will be back in stock. In some cases, we may run out of an item while processing your purchase, and this may prevent us from shipping the quantity you requested.