Probably this goes for strong solo BTC miners and BTC pool operators.

I want to buy one mint BTC block (> 25BTC) to an address of my choosing.
Note: so the coinbase transaction should have the 25 BTC reward output sent to the address I will provide.
So it's not that I want to buy just 25BTC, I need the mint block with no other transaction between.

PM me your price/markups, easy good money, I pay upfront (in BTC) to a respectable escrow mediator of your choosing, or directly to you if I feel ok.

0.2 BTC referral reward to anyone that gets me the one.

Let me know if you have questions (on the sales part). Prefer private PMs