Regarding airline tickets, searching "City A to City B flights" on Google will give you an option to see daily prices 6 months in advance. The Google travel thingamajigger has all kinds of cool bar graphs.

Dear cat:
I love you dearly, but I'm sleeping with my right shoulder up because it's sore. When you decide to come make biscuits on that shoulder while I'm sleeping, it's not going to be a happy response. I'd love a foot massage though!