Glad my spreadsheet was helpful!
Mousesavers has useful info on AP discounts they keep updated:
For saving money, you could look into using credit card rewards programs to get free or discounted stays etc. I used the Chase Visa and Barclaycard Arrival MasterCards rewards this year to save a ton of money.
Of course, you’ll want to read up on credit score info, how to manage it and how possibly getting multiple credit cards might affect your score, but if you’d like to go down that rabbit hole I have a forum post with my experience doing it for our last trip:
Pre Trip Report or How I Embraced Credit Card Rewards and Learned to Love Them