List them all (priced individually) in the same ad and maybe mention at the bottom that you're open to package pricing. But most of the time if someone is interested in more than one they'll ask anyway.
That color looks amazing in your pics, I can only imagine how great it looks in person and under stage lights!
Mystic Blue is listed as a regular color: https://www.gretschdrums.com/drums/usa-custom but I've heard they'll do one-offs as well.
I've never seen lacquer be cheaper than a wrap. I'm guessing they did it because a lot of people consider that a higher-end or nicer product vs. a wrap. The site also mentions the metallic sparkle is a first for them, so maybe they're showing off a new toy.
I know they're trying to be true to...