Nice find! I've been scanning ebay lately for some low cost vintage decks to get my feet wet. Still reading through the H. encyclopedia and don't want to get in too deep before having a better understanding of what I'm doing. Plus, prices really seem all over the place.
When searching eBay, you're better off seeing what decks have recently sold for, rather than what people are asking for today. Filter your search to show only sold items and you'll have a clearer picture of what something's been selling for recently.
I've heard of other places to get vintage decks at auction, but by and large, they're probably out of your budget! We're talking about serious auction houses rather than online-only ones like eBay.