I bought this Kingston 1GB PC2700 module: Outpost # 3325732 http://shop2.outpost.com/product/3325732?site=sr:SEARCH:MAIN_RSLT_PG It costs $160. Its box says it's not for dual channel systems, which is fine because I bought it for my dad's Mac mini. After seeing the video about how to upgrade the mini's RAM I decided to have a professional install it. First I called my local Apple store. They don't install "3rd party RAM." Then I called Mac Specialist. They said they'd do it for $40. I thought, that's okay because I'd rather be out $40 than have broken mini innards. I took the mini to the service department there and gave the computer to the technician. After five minutes or so he came out and told me the closest thing to the recommended tool they have is too thick, and that the official Mac mini toolkit from Apple won't arrive until sometime next week (maybe). Then I took the mini to CompUSA. Luckily the Apple Certified technician there had already upgraded a mini, so he had experience. I was a little worried about my machine being a guinea pig. However, the guy didn't have his putty knife with him at the store, so I left the computer with them overnight on Friday and picked it up Saturday. CompUSA charged only $30, which I think is a good deal. I still saved more than $100 compared to buying the RAM from Apple. I ran the extended Apple Hardware Test and the memory passed.