There are also a lot of thieves on Ebay, would would like to claim any vintage laptop is "rare", so they can sell it for some wildly inflated price.
OK, the "PnP" spec (plug and play), for most all laptops over the years is a standard 2 1/2" drive.
This search page from "Newegg", illustrates the range of drives available for mobile use:
http://www.newegg.com/Laptop-Internal-Hard-Drives/SubCategory/ID-380?Tpk=laptop hard drives
You DO NOT have to be concerned with brand. All you need to be concerned with is, the speed, (RPMs, 5400 or 7200), and the capacity, (250GB, 500GB , 1TB, etc,), and obviously the price. You could also perhaps use one of the new SSD's (solid state drives), but it's very doubtful if the buss speed of your machine would allow you to take full advantage of the high performance of this type drive.
So, pop the back off of your laptop, and verify whether or not I'm correct about the drive size, then try to catch a sale on a brand new drive, plug it in, and you're good to go.
FWIW, decent "on sale" laptop HDDs are usually priced somewhere in the area of $50.00 US.
Just make sure you still have the original "restore discs" or Windows disc, to get the machine back up and running after you replace the drive.