I've been on both sides of these kinds of sales, and I really don't see what the issue is. If someone asks you if you'll take a lower price, and you won't, this is what you say: "No". If you're insulted - well, you get insulted easy, and it's no one else's fault.

Nobody owes you anything - you may think your BBQ is worth $50 - but maybe it's only worth $5 to me, and maybe I'll only take it if I can get it for $5. So what?