he may like history, many of the nonsports cards have alot of history
If you go for collector grade stuff like I show below you can often pick up cards for $10-20 or even less, on eBay.
My fav is the N2 cards....
The cool thing about the N2 Indian series is they are now 124 years old, and from the Era these Indians lived in... very cool to me, I would have loved them if I was 10. (there are many other series with lots of history too)
1888 (N2) A&G American Indian Chiefs series
(these were all under $20 and found on eBay in last 5 years)