$70 for the supplement seems wasteful if all you need are the 2 pages.
If you are not in a hurry, keep an eye on the
ebay sales for used albums/collections. I see two modern National albums with minimal stamps that sold within the last month for $29 and $39 respectively, with a low shipping fee of around $8 each. That's better than $70 and you may get a few stamps included that can help subsidize the cost.
Or seek out a local stamp dealer, stamp show, or stamp club. Old collections from estates are being donated all the time, including many with minimal value that dealers are willing to sell cheap.
I have 2 or 3 such collections and happy to send you the two pages, but you'll have to get those 50 or more quality posts here before we can exchange emails. So, for starters, what do you collect? What is your favorite stamp? How did you get started? What is the biggest mistake you made as a beginner? There are a number of threads with those topics where you can post your replies and increase your post counts, or start your own thread with a topic(s) of your choosing.


Good luck and have fun. The hunt is half the pleasure of collecting.