I think that you would be best served to view tick volume for Eurex, CBOT, and CME futures products as a Market Profile study on CQG. This is basically a vertical histogram that provides relative volume for each price area and timeframe. The CQG with a few extra studies is about $800/mo. w/ all exchanges. CQG's data is very clean and intraday data goes back a long way.
In terms of actual trading volume as it occurs at each price, the Bloomberg is very good. It is an incredibly useful tool, and for interest-rate traders like myself it is mandatory at $1500/mo.
The best volume data is the actual exchange marketplace itself. I have a front-end linked to the order-matching engines for Eurex, CBOT A/C/E, LIFFE, Cantor E-Speed, and CME Globex, and am a member at all these exchanges. That, my friend, is the ultimate volume indicator.