CHEAP vacation photo backup? No laptop, no internet cafes, no portable hard drive

I searched the forum but I'm still confused, so here goes. I need some way to backup my photos while I am on a week long vacation without a laptop. With the MP of my camera I doubt I'll take more than 4 GB of pictures. I know there are dedicated portable back up hard drives, but that's too much dough for me. Internet cafes will be few and far between so uploading the pics or burning them to DVD won't work either.

Since my backup needs are so small, I feel like backing up my photos daily on a second SD card would be a good option. The question I have is, is there some way to copy pictures from one SD card to another? If so have people done this?