This could be useful.

Per MacMegasite, MyService has released a new 750GB 7200rpm hard drive upgrade for the MacBook and MacBook Pro notebooks. These new 2.5″ Momentus drives by Seagate are the largest 7200rpm hard drives available for the MacBook and the complete upgrade service is US$299, the price encapsulating the new 750GB drive, round trip shipping, professional installation and data transfer.

Your old hard drive is returned to you and can be used for backups. Since MyService is an Apple Authorized Service Provider, the 750GB upgrade will not void your Apple warranty.

Once your laptop is back at MyService, a certified technician installs the new drive and transfers the data over from your old drive. All drives feature a 3 year manufacturer warranty. After the service is completed, your notebook is cleaned, tested and sent back to you, along with your old drive. All services are completed within 24 hours of arrival.