What should I do/ get my boyfriend for our 2 year anniversary?

We've already done almost everything imaginable. I made him a scrapbook, he's made me a picture frame, I've put all our pictures over the past two years in a digital picture frame, he's taken me on a helicopter ride, and swimming with dolphins I've written him a letter with all the reasons i love him and taken him to his favorite restaurants. He likes his car, and I like Photography. I'm all out of ideas and I have no idea what he's doing either. Any Ideas? Nothing too expensive. Preferably under $100. oh, and I'm 17, he's 19.