Depends on where you buy it. Different places have different cost. But if you want cheap, I suggest Ebay because my mom is a seller on there and most stuff she buys from there is cheap. It's an online store if you don't know what it is.
about $500
Go to Ebay
You can't buy Halo Wars with Microsoft points.You have to use real money.
Halo Wars will cost $60 at launch for the standard edition, with special editions costing extra.
I don't know but it costs 19.99 at bestbuy. (woot!)
Play as Prof. Anders.
Halo wars is unavailable in ps3 as it is a Microsoft game so it is only avalaible in xbox360.
Halo Reach approximately cost $59.99
Halo Wars is only worth about 10 bucks brand new, pretty crap game though
Halo Wars
From what I know, there is no Halo Wars on the PC.
Halo Wars happened in 2009.