Just to clarify, I only wanted one of each of those (which is what you have posted, I believe) - that is, one Amber, one Azure, one Lemon, and one Orchid. I looked into the prices on the item database - it looks like I was a bit off with my offer (sorry about that), but not by as much as 5.4mil.
Their shop base prices come out to 12,500,000 [2,000,000 (Amber) + 4,000,000 (Azure) + 3,500,000 (Lemon) + 3,000,000 (Orchid)]
Their average merchant sales come out to 13,210,145 [2,480,629 (Amber) + 4,076,729 (Azure) + 3,467,952 (Lemon) + 3,184,835 (Orchid)]
And the most recent merchant sales come out to 13,890,000 [2,500,000 (Amber) + 3,645,000 (Azure) + 4,000,000 (Lemon) + 3,745,000 (Orchid)]
So I'd be willing to bump my offer up to 13.3mil for the sake of convenience (because this is a lot easier for me than camping the Black Market) - but I'm pretty sure I'm not undercutting you by that much, unless I was unclear about which ones I wanted to buy.
That said - would you take 13.3mil for the four?