I also do what zapman does, although not from Costco. I use pork mince and pork belly for breakfast sausage and bacon (all quality stuff, but still very cheap per portion).
If you check the ingredients and calculate it out, you'll find that protein bars are no cheaper than meat (certainly not at Costco prices) but the protein is shit quality. Here's a "Cellucor" bar, which you can apparently get for 0.79 if you shop around:
Total Fat: 9g (3.5g saturated)
Carbs: 26g (10g fiber, 8g sugar)
Here's two 50g (medium) eggs:
Protein 25 g
Fat 21 g
Carbs 2.2 g
Which is about as perfect as you can get for weight loss, while the bar seems engineered to make you fat. The eggs will cost you NT$22 for free range, ie., US$0.75.
zapman's beef mince (90g):
Protein 23 g
Fat 13 g
Again, great ratios for fat loss, NT$22 per serving. Eggs and beef are both giving you more protein than the bars at $US0.75. Minimal effort to make a burger patty or an omelette.
Processed-food manufacturers depend on the consumer not doing these calculations to make their profits. Their products aren't nearly as cheap as they make out. Most bar manufacturers are selling at $2 a pop, and the retailer puts $1 of that in their pockets.
If you need your food pre-prepared, you really can't beat the bian dang buffet shops. They sell at a very thin profit margin and you can heap up whatever you need for your workout nutrition. I've never paid more than NT$80 for a plateful of meat, eggs, dofu and veggies - bear in mind that consuming more than about 25-30g of protein (=120g meat) in a sitting is pointless because you can't metabolise it efficiently.