Ebay can be a good resource-- if you are very familiar with what you need. I would not buy parts from someone (for my 1st time around) without tech support. I am not real familiar with Gateway products-- but you can get ripped off on auction sites if you're not careful.
Want good deals/info on companies??
I've been a member here for years.
I am NOT connected financially to them.
Ratings are done by MEMBERS--FOR MEMBERS
http://www.resellerratings.com/
...I have never gotten bad info from this site -- I recommend them wherever I go. I can't stand to see anyone get ripped off.