which cards can do directX 9?

I am totally confused:
Bought a game for my son: Lego Bionicles (PC). Per
the box and website, it requires DirectX 9.0.
The box also says ATI Radeon w/32MB or NVidia..
http://shop.lego.com/product.asp?p=14683

OK. I need to get him a new graphics card
(currently cheap built-in graphics, but there is
an AGP slot.)

When I look at the ads, only the new ($$$) say the
are DirectX 9. (And obviously nothing with only
32MB of graphics memory is in that category.)
Can older and/or less expensive boards support
DirectX 9.0?

As the box says it only needs a card with 32MB, I
doubt this is an overly demanding game. What cards
would you recommend for up to $75 that would
support DirectX 9. And how much more can I get if
I go to $100. (Bearing in mind that this computer
will probably get replaced in ~2 years and we will
move on to PCI Express, etc.)

Thanks in advance.