MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
I would use 8020.net if you are in the states. I'm in Canada and just ordered it all from Aliexpress because there are literally no suppliers here that do 3030 extrusion.
If you do go the aliexpress route I found that if you order a larger number of packages with a small number of items in each you can get better shipping rates. In total my frame and the rods will cost about $200 US.