Guaranteed, back then, there wasn't as much "stuff" to get as today. A lot of it was contrived. Believe it or not, there were archery shops back in the 60's and 70's and until the 70s, not a one of them saw fit to sell compound bows ! Most were mom and pop stores, someone who hunted a lot that opened a shop, often in his garage.
It was seemingly during the 70's that the sky opened and the race to supply anything begun. I recall building or refurbishing bows, building tree stands when they were finally legal. Broadheads were available. I don't recall much in the way of mail order back then. Certainly no web sites.
ChuckC