IP transit is pretty cheap and is expected to continue to fall in the future.

For example here: http://henet.p2knowledgebase.com/view/short_post/WnL8B

You are looking at 1Gbps-on-GigE of $380/mo.

You can run that 24/7 (sometimes they bill you at 95th percentile) but this looks like it is flat rate.

So all the data you can transfer at a 1Gbps pipe.