Need Another Memory Card

I though two 8 GB memory cards are good enough for me to store my photos. I was quite satisfied at the first few months until last month. I do not enough space to store the photos I captured using my DSLR camera anymore. I need to snap photo in jpeg and raw file. The space I am using to store photo has become very large. Two 8 GB memory cards are enough for two days photos only. I think I better get another memory card now.