Thanks for the info and links. Most of you guys have probably seen these articles before, but just in case, here are a couple articles on the Fleer WS cards:
http://www.sportscollectorsdigest.co...d_series_cards
http://www.vintagecardtraders.org/vi...r/78fleer.html
laughlinfan: the author of the second article mentions that in 1978 he bought the Fleer WS cards from the local Good Humor man. Maybe you've already contacted him, but I thought I'd post the link in case you haven't.
The first article mentions the Kellog's 3D cards that were available inside Kellog's cereals. That brought back some memories, and I have several of those from (I think) 1970,71, and 72, including a few football. I don't know how a kid could have possibly assembled the whole set of 75 (a kid can only eat so many bowls of corn flakes per month!), but the author mentions that you could buy the full sets from Kellogs by mail. I sure don't remember that.
While looking up the 70 Fleer WS cards on e-bay I noticed that if you instead search for 19
68 Fleer World Series you get more hits. I guess the sellers mistake the copyright info for the card date. Some sellers bundle the cards in groups of 5 or so, and seem to mix and match the 70 and 71 cards as if they were from the same year.
If anyone is interested, an ebay seller called aalop1 has 108 of the 1967 Laughlin black & white world series prototype cards as buy-it-now.