Hi,
aside from the BTC to pay for the accounts you just need a set of public keys to transfer the accounts to.
We can just use your current account's keys for that if you want to. Alternatively, you could create another set of keys using the cli_wallet and use these for the account transfer.

I am currently trying to find a reputable escrow provider who will handle the transaction. Once we have agreed on the set of accounts to transfer and the Bitcoin amount to pay, the escrow provider will give you a Bitcoin address for you to send the BTC to. When the coins have arrived, I will transfer the accounts to your keys so you can use them.

How many accounts would you like to buy?