I actually did install wireless router in one school.....

It would be better if you can take as many wireless cards with your routers.... i've no idea how much it cost right now in Nepal but it was pretty expensive then the router itself.... But I wouldn't suggest you taking any electronics gadgets beside laptops and apple's products.... You can get anything you want and of the lastest....

For you second question...... It might wight .......but I think NTC will give you for free...