Suggestions for your prizes in the treasure hunt:
eBay has a category, Collectibles > Historical Memorabilia >
Astronauts & Space Travel.
1) Space themed postage stamps. (You can get these for a song)
2) Russian metal pin badges. (You can get a dozen for around a dollar each)
3) American embroidered patches (although there are some bargains, 5 to
10 dollars each is the rule)
4) Styrofoam gliders. I got 5 for $5.75 on eBay. (bring paper clips for
when they lose the propellers)
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=350929428088
P.S.: If you have any small vacuum tubes, the kids will probably treat
them like alien artifacts.
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