[G4] Question about Firewire enclosure / hard drive

[Michelle]

Hi,

Please forgive the newbie question, but my G4 "Sawtooth" needs more 
hard drive space and my current arrangement is just entirely too slow 
(using a LaCie "Brick" USB external drive.) The "Brick" is fine for 
backing up files, photos, etc - but is way too slow to use for much 
of anything else.

I am just now learning what exactly a "Firewire Enclosure" even IS... 
and what it would/could do in my situation. It sounds like a 
reasonable route to go, for additional hard drive space at a faster 
speed than the LaCie external drive.

My question to you all is - if I buy the enclosure "thing"... (I 
found some on some respected Mac websites, am thinking about one made 
by "MacAlly") - where do I then purchase the actual hard drive to go 
inside the thing? How much would I expect to pay for the actual 
drive? The website says that the MacAlly enclosure "Supports any 
capacity 3.5" ATA (IDE) Hard Drive"... but I have no idea where to go 
buy such a thing.

Any suggestions would be great.

Thanks,
Michelle