I think this may be a Toshiba model based on the coding but I am not sure.
You may be able to get cases and keyboards, etc cheaper off Ebay than from Toshiba directly.
Ryan has posted very good prices on Dell keyboard upgrades, case upgrades (Dell 8600 to Dell D800, etc) but if you can't find a good price at Toshiba.com or through Toshiba service (obviously this is not a warranty issue unless you have the extra accidental damage coverage) then Ebay is probably the ticket -- or perhaps a local notebook repair facility would have it.
Also, drop a line to Ken at Ifixit.com who posts here
i lent out my notebook and they dropped it! it came back with the corner smashed in. both the cover and base were damaged. the screen is undamaged. can anybody direct me to where i might buy a new cover and base assembly to remedy this now poor looking machine. all the looking around i've done has yet to turn up information for this particular model. i guess it may be to new. thanks in advance for any help offered.