dillema?

Okay, so for my birthday (months ago), Nicole got me a $50 gift card to Best Buy so that I'd have the money to buy the Sims 3. But Best Buy doesn't sell the Mac version. Which meant I was stuck with a gift card (which I still want to use and love, haha) but no Sims 3 purchasing.

But then my aunt and uncle gave me a $50 bill, which I could use to buy the Mac version (at the Apple store, obviously). So now I can buy the Sims 3, but I still have my useless (well, not really) gift card.

I was going to use it to buy another guitar for Rock Band 2, since my older brother and I always fight over the guitar (we both play expert, but I actually play guitar and my younger says I should be the one playing it). That way he'd be forced to play bass, and we'd have enough things for the people who don't like singing (...like me :|).

But, when I looked online, I found that it was too expensive ($55-$77, which means no left over money ]:). So now I need a new thing to buy. Any suggestions? I have a PS3, PS2, and XBOX, but I like the PS3 best. I also have a Mac, but I only wanna play Sims 2/Sims 3 on it, sorry.