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You can get a replacement touchpad either from Toshiba directly or from various Internet sellers like eBay, which is often cheaper. The procedure for changing the touchpad depends on which Toshiba model you have but in most cases it shouldn't be a problem to change it yourself.
If you tell me the model name of your laptop, I could try to look up which touchpad you need and how to change it.
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Its a Satellite L300-29X
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Thank you for your patience.I have found the information you need.
Below is the link to the Toshiba L300 Maintenance manual, where you will find the procedures for replacing the touch pad on page 4-51.
To order a new touch pad including button board, you should check out this website: