I was lucky enough to get one of the two, I was even the first sucker. I googled the song and saw 5 Osmonds and then made a table in Excel that raised numbers to the 4th power and added 5 and just started picking numbers at 9^4+5 and moving down. I cannot believe that actually worked.
Probably brute force attempts. Based on the pattern, the only valid values are 10-17. Easy enough to try 8 different URLs to see which one is correct, especially when it happens to be the first one (10).
Is this how you post the link? woot.com/(Unique Presidents whose last names would have a Scrabble score of 15 or higher, assuming no scoring specials, and if they were legal to play, which they aren’t)^4 + (Osmonds performing on “Puppy Love”) /offers/d1c1756c1fe44ee99221a76a9bc3e