Herodotus Online Link
I know some people find it a pain to cart that large physical version of the book around on planes etc. (I will confess to being one). As such I wanted to share that I found an easy way to download it to your notebook (albeit the Rawlinson translation) or read it online. Here is the link:
I am the opposite of tech savvy, but even I was able to do it in about 30 seconds. Just click on the line that says download and save it to whatever file you want.