A few I was able to pick up (even after pre-regs)
Reloadable.cards - great niche market as many institutions (ie, my Starbucks card and AMEX gift cards) are now 'reloadable'; they start out with an initial value then the user can go online and add more value to the cards. This allows the consumer to keep and reuse the card without having to wait for a new card. Also was a great feature out in San Francisco when I had to reload my BART card.
Scrip.cards - This is usually a card that is used in local communities that takes the place of gift certificates. Often these are purchased at fund raisers where the local business community will offer discounts to the user.
StoreValue.cards - pretty broad market since most stores will issue a "store value" card instead of cash for the merchandise returned, especially if you do not have the receipt
apr.cards - I looked at several variants of this (LowAPR, ZeroAPR, VariableAPR) but instead found APR was still available. Now I can create a site or lead gen to all of those and the sub-domains are as endless as the APR allows
StudentID.cards - hard to find an institution of higher learning that does not require (and issue) Student ID cards
StateID.cards - for senior citizens and those who do not have a driver's license, several states still require some sort of Photo ID card. Nearly all states have a State ID card program in place.