Is there one around yet? I wouldn't mind starting up a new business around this idea.
Are you referring to a card that has bitcoins stored on the card itself? Because of the nature of bitcoin, that concept doesn't work -- you need a device to manage the security and facilitate transactions -- and that is something solved with a mobile device. See BitcoinSpinner on Android as an example.
Or are you referring to a system where the card is simply a credential that will let you spend bitcoins from a bank service. This has been proposed but because bitcoin is meant to be a a decentralized currency, this approach has few fans to date. It would also require the merchant to acquire a card swiper that the customer would use to enter a PIN or an NFC terminal or something. Nobody is working on this, at least not that they are publicly discussing. Online, of course, this "debit card" concept doesn't apply, and is served by users with a bitcoin client, an online wallet or through payment processing such as that offered by Bit-Pay, Mt. Gox.
One category of a debit card is a USD-denominated physical Visa/MC cards (sent via mail) for making purchases at any merchant but where the cards can be purchased with bitcoins.
The follow are purchased and reloadable with bitcoins:
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https://www.aurumxchange.com/cards -
https://www.okpay.com/en/services/debit-cardThere are others but I'm not listing them here as I don't know much or anything about them. They might be found here:
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https://en.bitcoin.it/wiki/Trade#Gift.2FDebit_Cards -
https://en.bitcoin.it/wiki/Trade#Gift_CardsAs far as purchasing other USD-denominated cards, there are different categories of that as well:
Virtual, prepaid gift codes (purchased and order fulfilled entirely, online)
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http://www.spendbitcoins.com (Amazon, Barnes & Noble, GoDaddy, Southwest Air)
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http://coincard.ndrix.com (Amazon, Best Buy, Dominos, Papa Johns)
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http://www.btcbuy.info (Amazon, Think Geek, Sears, NewEgg, Drugstore.com)
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http://www.btcinstant.com (Virtual Mastercard)
Physical gift cards (via mail):
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http://coincard.com (new, appears to have site issues currently)
Any there are many prepaid debit cards that can be reloaded with a MoneyPak (e.g. Green Dot, WalMart, AmEx or dozens of others listed here
https://www.moneypak.com/WhoAccepts.aspx ).
You can buy new MoneyPaks here:
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http://www.btcpak.comThere is even a service for buying bitcoins using your Visa/MC/Amex prepaid debit card:
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http://www.Get-Bitcoin.comIf you notice, there is lots of need yet unfulfilled.
How about prepaid mobile phone service? e.g., T-Mobile prepaid cards?
These can be bought wholesale (e.g., at a discount) and then can probably be sold at a premium even. But nobody is offering this, at least not in the U.S. In Thailand, BhatCoin is selling phone cards for Bitcoins.
Or even direct competition with an existing service -- there could be a market to support more yet.