A little primer:
Go to Coinbase, register with name, password, etc.
Link a checking account.
Verify with some email procedures.
Buy some bitcoin.
Then, to buy seeds, you get your send/receive address from Coinbase, paste it into the order screen, and within a couple minutes, yer done.
Not easy to do all at once, but comparable to the phone/bank/wait for confirmation dance. And once you have the account at Coinbase, you can easily restock bitcoin in minutes.
Jus' sayin. It ain't easy but it's worth the hassle at first.