When it comes to Northern Lights finding original genetics can be rather difficult and what most people will find is knockoffs and they will vary in quality.
The genetics of Northern Lights is one of the most confused of all existing cannabis seeds strains because there is no one who can take entire credit for its creation. Northern Lights was developed as an indoor cannabisseed strain in the late 1970s near Seattle in Washington, although the genetics involved in the cross were known to have come from California - the original home of a great many of the most famous cannabis seeds strains. It was initially a stabilised cannabis sativa strain crossed with an Afghani indica hybrid.
Northern Lights travelled to Holland as a clone where it was introduced to the commercial cannabis seed market in 1985 by The Seed Bank.
Because it arrived as a clone it could not be inbred for stability and cannabis seed production, therefore Skunk No 1 and Original Haze were used to produce seeds off it so it could be used as a parent plant.
Northern Lights distinctly shows its Afghani indica genetic background; it is a small plant that produces, big highly resinous flowers. Although it was initially developed for indoor growers excellent results have been produced outside.Northern Lights has a sweet resinous taste and produces a physical comfortable but lazy feeling, known to some as "couch lock".
Northern Lights »»» Afghani x Skunk No. 1 x Haze F1
What you may want to do is do a search for Northern Lights reviews and then decide which you believe to be the best and then check out various seedbanks and see if they handle that particular breeders genetics and if so and if it is at a price you can pay or feel comfortable paying and comfortable doing business with that seedbank and if they ship to the U.S, or if you can find their seeds from a seedbank that does ship to the U.S. buy them.
If not then pick the Northern Lights with the next best reviews and look around again and if you still cannot find them you may then decide that another strain may be the way to go but most likely you will be able to find what you are looking for.