Available here for ~$20 for the ones with the big ring at the top. ~$40-50 for the box shaped ones, and for $15 you can have a frame built for hanging above your bed...definitely worth it. You can buy the deltamethrin (like permethrin) to treat your nets over here (anti-mosquito) for less than forty cents. It's made by Bayer, so I feel good about the quality.
Bottom line: Buy and treat mosquito nets in Malawi.
For small children-it is recommended to have a net to cover strollers or car seats for those evening walks to and from potluck. You can buy them in the states. I also have a few to give away if needed. -Bethany