You can order components from any vendor you trust just make sure that it is supported by Circuito.io.
At the moment, we support mostly components distributed by Sparkfun, however, in the near future this is going to change.
In the meanwhile, there are quite a few components, that are standard, and they will be similar or identical no matter where you buy them. That being said, it’s always best to make sure that the component you are working with not only looks the same, but is also wired the same. For example, an RGB Diode and an RGB Cathode may look the same, but their wiring is different. If you connect it improperly, it may malfunction.
When you click on the “i” icon next to the chosen component, you’ll see that at the bottom of the pop-up screen it says “buy now”
you will be redirected to the exact component supported by circuito.io. And will be able to view it’s datasheet.