Posting this tip separately as per a request on another thread:
If you are shopping around for tickets / holiday bookings online, make sure to clear your cookies before booking.
Many search/booking engines will store your previous searches in a cookie. When you search for the same journey/product again you will be quoted a higher price, hence giving you the (false) impression that prices are going up.
Once you have removed the offending cookie, the original price quoted will magically re-appear (providing it has not really been changed in the mean time).
I have in the past come across this with P&O Ferries, BA, EasyJet and AirFranceKLM among others. The same principle may apply to some hotel bookings - the trick certainly worked with one of my former employers (chain hotel).