"Halo Micro Ops High Ground Tower"
Here's a link where you can buy them online from Target for $12.48.
I took some pictures of the Master Chief that comes with it, a Space Marine and a Terminator for comparison. It's a little bit small, but it is nicely painted and it does look pretty cool.
I'm thinking of putting a plastic Space Marine on that hover bike (with a little conversion)
Master Chief is a little bitty guy...