I was incontinent for a year and 1/2 so wore a pad 24/7.
(Now I have an artificial sphincter. What a blessing!)
Name brands are everywhere:
Depends, Guards for maximum protection; 52 per pack.
Depends, Shields for lesser need; 58 per pack.
Assurance has very similar items.
I found local store brands, usually the same count per pack, to be as good or better at lesser cost.
Best of luck that your surgery goes super well, gets all the cancer, and you have great success with continence after.
And continue being positive and also prepared; good plan!
bob