The apple affiliate program through Performance Horizon Group has over 100 countries and pays out a flat 2% on iTunes Store, App Store, iBooks Store, Mac App Store, and of course the online computer store.

The platform is OK and you can place a pixel to see how your campaigns are performing.

The cookie only lasts for 24 hours so if he person doesn't make a purchase immediately then you do not get credit.

As a side note I bought my last computer through my own affiliate link and it did not track through.... so I question their tracking.

If you are doing computers specifically I recommend using the Amazon affiliate platform. They sell apple products and are the same price plus ship faster. They also pay on a tiered structure starting at 4% and going all the way up to 8% depending on the volume of sales you generate.

Amazon is not available in all states though.

If you are building a business around the apple affiliate program think twice (just my 2 cents).