I have used flipstory.com (no longer in business) in 2011 cu create 2 very nice flipbooks. It was 7,99 Euros, transport included from France to Romania. I still enjoy it, I keep it beside other family photos, as it's my months old son crawling on the floor towards the camera.
Good luck!
You can walk that much if you are healthy, have roads, have enough food and water, good clothing and shoes, there are no dangers that must be avoided and if you know what your destination is. If you have to stop daily to get food (hunting or gathering fruit), avoid or fight dangerous people and animals, figure out best ways to get along while carying whaterver possesions they had, shelter from bad weather, prospect for places to settle permanently or temporarily then it's a completely different story. It's also not like they had a deadline or something.