I'm bumping an old thread just to let everyone know that the price alert feature in Tripit has a few quirks. If you ever change the 'Price' field, say to revise a Southwest points booking to input a price rather than the $5 taxes paid, you have to enter it as "$ 200" or "USD 200" or the alerts won't function properly.

IE, I make a reservation using Southwest points worth $300. I want to know if a cheaper points booking is available, so I revise Tripit to say I paid $300 rather than the $5 in taxes that the 'Paid' field will show based on the email confimation.