Vantage/Woocommerce product image size

Hi,

Is there a way to change the size of the product images when using Woocommerce with Vantage? All of my product image sizes are different and it seems to crop them quite a bit and I lose a lot of the image.

See here: http://supergameco.com.au/product/arcadepartskit/
and here: http://supergameco.com.au/product/sgc-micro-arcade-2-player-edition/

Thanks.