Mokusei very commendable you are trying to spread the word of GNU/Linux, not a bad blog, looks good.
I understand you are going to charge for the shipping, just a few Q's and suggestions:
1. What are you going to charge for shipping, transparent costs would be great ?
2. Please do some research on the Free available options for the various Distro's and list them up on your blog, that way you do not come across as a 'shady" character and are also promoting GNU/Linux Distro's as they were orginally intended to be. If someone wants to order from you at a cost at least they are aware of the options and can make the 'Choice' that suites them best.
3. Would be great if you listed the various DE's and a basic rundown of memory usage compared with other DE's.
4. Please add PuppyLinux or Lighter DE's as an option for those that have lower spec machines, especially if your target market is South Africa.
5. Please add PCLinuxOS up there, it seems to be very unknown yet such a powerful Distro, i.e I have both Mandriva and PCLOS but would choose the latter anyday.