This week is Portland Burger Week! A bunch of places are offering $5 burgers, all week long.
A lot of restaurants treat this as a competition, to see who can make the fanciest, most unique burger. They go all out; the organizers estimate that these are $10-$15 burgers. The burgers are only sold during this one week, and never again. Limited time offer!
Is it just me, or is that a bad business plan? If I was a burger place, I wouldn't create a $15 specialty burger. I would sell my normal $8 burger, for $5. Sure, it's not very fancy to do absolutely nothing different during a promotion, but hey, a discount is a discount.
A lot of places sell out quickly. I think that's because of the super-fancy ingredients, which they don't normally use or keep in stock. There's no reason to overstock on an ingredient, if you're only using it for one week. I'm specifically thinking of the place that had big elk burgers, two years ago. They ran out of elk on the first day, and dropped out of the promotion. That made me sad. They still had their normal burgers available, so...why didn't they just drop the price on one of those? I still would have bought one of them for $5, even if it's not made from fancy elk!
I'm mentioning this, because every year, the organizers get really mean, whenever people complain about food shortages. This year, they used two swear words in the Burger Week description, just on this topic. Not very classy. If that's your #1 problem, I'd totally recommend the solution of not using fancy, one-time ingredients. You'll be less likely to run out, and it'd make the burgers cheaper to produce.
Of course, that's just me. I'm willing to give up fanciness for availability. I no longer live in Portland proper; it's definitely a trek for me to get to any of these burger places. So it's extra-nasty for me if/when they sell out.