Thanks all! I reserved these flights on opening day so I only paid $159 pp. So, it would be a big difference to upgrade to a flight in the $200 range.

I check several times a day as you just never know. Originally, we were returning on Jan 1, but a few weeks ago a flight on the 2nd opened up for $159 so I was able to switch it and add an extra day to our vacation! I couldn't believe it as this is prime time travel season.

Thanks again for all the suggestions.