The line at the post office was way long today...
Cambiocorsa, do as tobysen recommended - pick her some flowers and maybe cook her breakfast as well.
By the way, speaking of being broke / saving money - instead of buying greeting cards at the store ($3-$5 each) I have a program and customize then print to card stock paper from my computer. I figure with the card paper, envelopes and cost of the program each card probably costs me maybe 10 cents. Over the course of each year I easily save more than a few hundred bucks.