1.8 inch is a very strange form factor, so you'll run into problems there. Another problem you're going to have is that your notebook takes ATA drives, while most newer ones will be SATA.
The only place I can find one that should meet your needs is eBay
(note: not endorsing this seller or product). Make sure that the connectors of any hard drive you decide to get are the same as the one you currently have.