Most laptops have a switch mode power supply meaning they will run on 100v to 240v which covers all the major countrys, all that will be required is an adapter for the plug which you could sell or include.
as for TV's the case could be similar, just try the manufactures website or google the product manual and simply check its operating range.
let me know how you go, i'm starting out in australia to and would like to here from ya...