9.5mm Drive Dimensions This Driver Came With Laptop :: 40GB IDE Toshiba HDD2182 4200RPM 2MB ATA-5 9.5mm MK4021GAS, ?

This driver came with laptop :: 40GB IDE Toshiba HDD2182 4200RPM 2MB ATA-5 9.5mm MK4021GAS, ? - 9.5mm drive dimensions

and I have to replace. Can anyone recommend me any less hard than $ 50? and what is the most important thing that I remember, when I replace the hard drive?
not be ATA-5 or something else?
and should not be 9.5?
I am new to this stuff, and I need help.
Thank you.