Coinbase has a Level 1 and 2 verification. Level 1 is easy and typically allows $100 instant buy for a week or $3,000 a day on the bank transfer process, which usually takes 4-5 business days. Level 2 verification needs personal identity and a backup credit card. In addition, your account needs to be 30 days old and you must have done a transaction. Even with that, you have $1000 instant buy WEEKLY, which is not that much. Your daily amount is much higher, but remember that takes the lengthier time.
Another possibility would be to get DGB on the VaultofSatoshi.com, which is a fiat to crypto exchange. May be another avenue. I am interested in purchasing a couple million DGB but am restricted by the slow process to have fiat at a wallet.
Hope this helps.
YC
What's with the low price recently? Almost everything else is up today but we're still languishing in the 160's. I don't want to be alarmist but without more buy support DGB will get crushed when cryptsy lists it
It's in a spot to be very easily be pushed down right now to then be able to buy crap loads at a much lower price. I'm mad coinbase doesn't accept debit card. I'm so ready to buy more Digibyte. If I could at least dump these 20 million batcoins I have.

The low price is temporary. This coin has a bright future.
Yes, every market cycles. I do believe coinbase has an instant buy feature once they have verified your identity.
http://blog.coinbase.com/post/55203204550/instant-bitcoin-purchases-at-coinbase