All the talk about price is focusing on the wrong thing IMO. The regal angelfish is NOT a fish you bargain shop for.
Find a reputable supplier. Someone who has a local reputation for bringing in difficult species in good condition. Find a FLAWLESS specimen (no blemishes on fins, no marks on body) that is eating with gusto and acting naturally (swimming in/out of rocks, a bit shy), and buy it and don't even look at the price. They are not difficult fish if they can get to you in good condition and eating. The places that charge a bit more for fish (as long as they have a good reputation) are not just pocketing the extra money... that money goes into ensuring a better supply chain so you end up with a higher quality fish. If you're buying something cheap and hardy, this doesn't matter as much. For regals, it does. If you are unable to find a local place with a good reputation for bringing in high quality livestock in good condition, purchase from a REPUTABLE, what-you-see-is-what-you-get online dealer.
I have no idea how much I paid for my Regal, I must have blocked it out lol. But really, who cares? I have an awesome, healthy fish that eats frozen food from my hands and gobbles up pellets like candy. And unless I screw something up, I will have him for years to come. Whatever I paid for him, it was worth it to me.