Fix it yourself for ~$70.
I'm probably just misunderstanding what model is in the video, but my trackpad cracked awhile ago (felt like a grain of sand was under it, cracked because of uneven pressure), and it was my understanding the MacBook Pro (with the internal [non-replaceable] battery) trackpad could only be replaced if you replace the whole upper casing.
My question is: Is the model in the video a Mid-2009 MacBook Pro or later?