Are they deleted, or just out of stock? It could be they're backordered, and will return soon. Stop at the Member Services desk and ask if they can check to see if the item is deleted. For as popular as that is, I'd be very surprised if it was deleted. I've known situations where a product needed to be reworked, or packaging is changed, or even the manufacturer changes, so the item is gone for a time. But when it returns, it is usually better than it was before.
Not sure if we've talked about this, but when you see something at Costco you like, look at the price card hanging above the item. If there is an asterisk (*) in the upper-right corner of the card, that item is Pending Delete. That means that in its present form, it will be going away. It could also mean it's never coming back. But as I explained above, sometimes it's just because the item is being reworked. When in doubt, stop at Member Services and ask about it. They can check the computer to find out the status.
If there is a Plus Sign (+) in the corner, it often means that is the last one of that item. Buy it, or do without, because you probably won't be seeing it again. It won't be coming back.
If there is ever any price ending in other than .99 cents, it's a markdown price (on non-food items.) They do that to try and clear out the remainder of a product that is going away. So if you see a price ending in .77, .50, or even .00, get it before it's gone.
Dave