Laptop motherboards are highly integrated, and they're not usually intended for field replacement.
Your machine was first manufactured about five years ago and is no longer in prodution so, unless you find someone on a site like ebay who broke the screen and is parting one out, I'm afraid a known working replacement board could cost more than an entire new machine with similar or better specs. Unless you're up to installing it, it could cost even more.
Specs for your machine.
Example of a comparable machine on sale in the U.S. for $450.
The above example has a newer Athlon dual core CPU, 4 GB RAM, 500 GB HD and includes Win 7 64 bit Home Premium.
If your machine is dead, some of the parts may be value to some local techs or on Ebay, including the screen, hard drive and burner, and the recovery CD/DVD would have value to another Toshiba owner with a similar model.
To recover your files, you can remove the drive and connect it as a slave to another machine with an adapter like
this one that can connect any SATA or full size or notebook PATA drive to a USB port.
Good luck.
