Sony has apparently quietly launched PSN Cards in $20 and $50 denominations. Sony did not officially announce them so we do not know if they are available everywhere at this time.
These should satisfy your non-credit card having and gift-giving needs for PSN content.
Kotaku notes, however, that they are only activated when they are run through the register so stealing them won't do you much good. Unless you have a spare register at your apartment... don't steal.
Kotaku: PSN Cards FINALLY Hitting Stores
