Expo markers are awesome. They always work so well. I love that they always comment such a large variety of colors. They're pretty affordable for how long they last. You can buy them almost anywhere are usually bought them at Walmart.

These markers come in a variety of bright colours that make it easy to emphasize important items. They are true to their advertising, which says low odour. The odour is hardly noticeable.
They last for a decently long time, but eventually they do fade and become harder to read.