PerfidiousRaoul said: "I'm creating a set design for The Great Comet of 1812 (obviously unofficial), but for a touring production. [...and...] This doesn't need to be extensive, I honestly just need to brush over it."
You are the designer of the set, so only you know what materials you will need to build it. Have you (at least roughly) calculated its dimensions? Have you made a sketch of the design and decided what what materials you'll need to build it (i.e., wood, paint, fabric, yadda, yadda, yadda...)?
Once you've established the materials and dimensions of your set, you can then start calculating the quantities you'll need of each element. Always order more than you think you'll need. After that, you can google, or make phone calls.
As an aside, you mentioned that your set will be for a touring production. I'm not 100% certain of this (as I've never done a tour), but I believe that a touring set is more demanding to design and build due to the need for it to be constantly assembled, then disassembled, yet still be structurally sound and safe for actors/crew throughout the tour.
If your set were designed for a sitting production, you could get away with using cheaper materials that did not have to stand up to the rigors of a tour i.e., using faux materials like styrofoam moldings, etc.... Just a thought.