macsales.com and you will find what you are looking for.

If you don't like that place, then a Google search for "ide laptop hard drive" turns up dozens of places that are selling them.
you do NOT have to specify that is for a Mac, any IDE hard drive will work. You wil just have to format the drive to suit you machine.

I saw a 100GB one (brand new) for $89.00, which is not that bad.

P