Hello again whack,
You should be able to get most of your stuff from Courts if you're planning to buy everything at once...
I don't think it's a good idea as they might be more expensive than in specialised shops. Don't limit your search to Port-Louis....
With regards to video gaming, I would advise you to buy your console in Rose-Hill - a nearby town 30 mins away from Port Louis as there is a concentration of shops specialised in Gaming (speaking from experience as it's my home town....I used to be a hardcore gamer as well).
Same goes for the other stuff. Don't buy everything at a general hypermarket - just look for their respective specialist shops for better deals.
COMPUTER HARDWARE STORES/GAMING:
MOBILE PHONE STORES:
Please bear in mind that mobile phones are sold in most large shops, so it might be worth looking around!
Don't worry too much about those things now. Once you're in Mauritius, get to know the places and bargain around....