We are looking to distribute the best tube skylights and maybe windows that are out there. Particularly those that can handle the extreme climate here in Minnesota and are not available here already. Any suggestions?

We sell both Velux and Natural Light skylights. Velux makes a great skylight, but Natural Lights tubular skylight is a better product because of the way the dome is secured into the flashing without putting any holes in the dome. 

http://www.nltubular.com/

Regarding tubular skylights:
- I installed the Velux tube skylight in my house and love it.
- Since then however, I think that Solatube has improved their energy efficiency with their models Solatube Brighten Up Series; 160 DSe and 290 DSe Daylighting Systems. From what I understand these models qualify for the current federal tax credit because they meet U-factor and Solar Heat Gain Coefficient (SHGC) maxima of 0.30.
The Solatube skylights must be good to be able to meet the strict energy efficiency requirements of a Passive House. See http://www.100khouse.com/2009/12/18/final-pictures-from-the-philadelphia-passive-house/ and scroll down to the picture of the bathroom.
- Solatube would be my choice unless Velux or some other tubular skylight manufacturer came out with something better.

Loewen Windows, from up near Winnipeg, makes some of the most energy efficient and highest quality doug fir windows with double Low-E triple glazing available. They're available in wood or wood with extruded aluminum cladding. Loewen's triple glazing U-values are equal to the much hyped "Heat Mirror" or "Serious Windows" type triple glazing but without the risk of the plastic film failing after a few years. Marvin, from right there in Minnesota, is also a high quality product and is also introducing triple glazing. It's available now as a special order but will soon become a standard option. Marvin also offers a fiberglass window but it's not available with triple glazing. I've been specifying Loewen and Marvin windows for years because I know they're both reliable products for a reasonable price and the contractors and clients are always happy with the results. Pella is also a good product for the price but I'm not as happy with their options. Even the best quality vinyl windows may be initially energy efficient but, like vinyl siding, they'll end up in a landfill after 25 years. Nothing "green" about that.

Tube skylights are a great idea for daylighting but the manufacturers have to greatly improve the insulation system on the tube and use an air-tight, insulated glass ceiling lens before I would consider them to be energy efficient. Like any skylight, they're a big hole in your ceiling insulation. Not so great in a cold climate. I'm in southern Wisconsin.

Loewen windows look like good windows, but they have a local distributor.

I disagree with your assessment of wood versus vinyl windows. In my experience wood framed insulated glass windows do not have a long life expectancy. Not only do they deteriorate from the obvious, exterior, but also mildew, rot and turn black on the inside from condensation.

Plastics last longer than wood.