Actually one of my choices. Must be some unwritten rule to tell the signifcant other you shouldn't exchange gifts but in reality you better get her something.
They have 5 for $25 of Victoria Secrets underwear. They give a nice gift bag with it. you can also get a bra, but those are about $40 for the push up kind, kinda pricey, but my wife loves the shit.
don't know how long you have been seeing each other but if for some time - you can still get her a "gift" without having to buy her anything.
give her a card that "entitles" her to one "breakfast in bed" where you will make something for her and bring it to her in bed. you are giving her a "gift" she will enjoy and it didn't cost you anything (other than the cost of the food - which you have to buy anyway). or if you already do this - maybe a "candlelight dinner" or something else along those lines. do you have a dog? if so - give her a card that entitles her to "get out of" walking the dog when it is her turn and you will do it for her (She will LOVE this).
think of something you can "give" her for free or darn near it that she will enjoy - and still not costing you anything
use your mind - you know what she likes so give her something she likes that won't cost you anything
better yet - if you have been seeing each other for some time write her a poem telling her how you feel about her. make it a good one and my guess is soon after she reads it the 2 of you will be :hump: :hump: :hump: