Have you heard about Goop? It's Gwyneth Paltrow's weekly newsletter with recipes, travel tips, shopping ideas, etc. You probably won't be able to afford 90% of what she recommends, but it's genuinely interesting and fun nonetheless.
This week they put together a great list of simple and inexpensive Valentine's Day ideas that anyone can pull off. And even better, there's a pre-written letter to your significant other suggesting that you would be amenable to any of the ideas.