Thanks for the tip, I have been searching there but best I can ever find is the coins for 8k each and I cannot afford that, hence my post hoping to find someone willing to sell 75 of them @5k ea, or an LS I can join up with to get 75 coins through runs with . . .
Joining an established Limbus group is one of the least efficient ways to get coins -- when they cost only 8k-ish each you can easily farm the money to buy them much faster than you can earn them in Limbus.
Also, if you can afford 5k each but not 8k each, that means you're only 200k-ish short of your Brutal Earring. That's at most a few afternoons of farming, even if you are a complete novice and farm inefficiently.
You're unlikely to find anyone willing to sell you a ton of coins for less than the going rate -- that would amount to someone just deciding to give you 200k. Just go earn a little cash and you'll have your Brutal Earring before you'd be on your second Limbus run with an established group.
That said, Homam gear is great for BLU. If you have the time and patience for it, there are rewards in Limbus that make it well worth doing. It's just that Ancient Coins alone aren't nearly enough reason to do Limbus.