This has been discussed a few times, the search function might be your friend.
When I moved here from Texas, I dealt directly with Lufthansa Cargo, and they were significantly cheaper than any of the shippers or forwarders. I schlepped my boxes directly to DFW airport and picked them up myself at ZRH airport a few days later ... Over 1,000 lbs for around $2,400.
Note: YMMV. Other air cargo firms like AA do not deal directly with consumers, supposedly some post 9-11 paranoia B.S. LH Cargo was easy and friendly.