OK, we're talking about cheap games, right?
So, the first thing I wanted to tell you guys about is froogle.com for those of you who haven't used it yet. It's a tool that searches for products for sale, including games. I believe it also searches for used games on ebay and other sites.
Anyway, you just type in the name of the game you want. It searches and gives you some results. On the left hand column, there is a link that says sort by: "Price: lowest to highest". Click that and more results will be displayed. After this, you will have to go through some guides etc for the game,because they are cheaper. However, keep going through the pages of results, and you will soon find your game for the lowest price found. I have found that this tool is very helpful at times.
Next (this is only for people who live in Canada)
futureshop.ca is a great site. It has games on offer all the time. What I have found is that as soon as a game comes out, it is reduced to $49.99 canadian on the site for a while. This happened for RE4 as well as Paper Mario & MP2:E. I bought RE4 and MP2 from there, and it really helped because the other stores didnt go less than $60. Occasionally it has other games on sale (1 example is Madden 2005 for $29.99 CDN in November). BTW it has free shipping too
another site is compusmart.com. This site is weird (in a good way). THey had Day of Reckoning for $29.99 CDN when it was $60-70 everywhere else.
Ok anyway sorry for the long post - thanks for reading