I just got back from Costco and picked up a box of the Zbars & I stand corrected. They were 24 bars for $10.47. We broke open the box on the way home (even after my pizza and pop from the food court!:).
If you can't find them at your Costco (some Costcos have different products) you can always ask them to order them. An employee told me that they can order thing if people request them.
PS Stay Tuned! I have several fun little crafting/sewing ideas coming soon!