Yep, some prices are nuts! $70-plus for just one catalog? 12 or 15 years ago you could usually find them for around $10 each. They're also a lot cheaper to ship than handbags especially if you can use Media Mail. Some of the newer ones are even duplicates of the same catalog pages from the same time period but with a different cover. You have to be really careful about buying the ones that might be just a few months newer or older than one you already have. If you go back to the early 1980s, they may have only made one catalog per year, the 1981 and 1982 books are almost identical, although the only place I've seen them is on the thumb drives and DVDs that sometimes turn up.
When someone charges more for a vintage catalog than many of the prices of the bags inside it, that's just plain greedy. We've seen enough shameless greed in these last few years to last a dozen lifetimes.