If you're buying your own paper, you can find a good selection at local office shops when it comes to card stocks and glossy photo paper. However, if you're looking for linens or specialty papers, you may have to go online. Always get a sample before buying a huge stack of paper, and do a test print, to make sure that whoever or where ever you're printing from can actually use the paper you've selected with your design and medium. Here are a few other places to buy paper from.
Tips For PUTTING IT ALL TOGETHER _ Paper cutting: The Internet loves to tell you that if you are doing your own DIY wedding invitations, you need to invest in a professional paper cutter, or at least a rotary cutter, along with a tape gun, and the list goes on. You can skip this by ordering paper that's cut to size—always double check to make sure you can print said format of course—and skipping any taped on embellishments. I promise, a fancy invitation need not have three layers of cardstock and the ability to stand on its own.