All stores that sell office supplies including Walmart and Amazon sell paper.
As for the rest of your question we may need more information on what you want. It may help if you can share the image on the forum. (Only if you own the rights to that image)
For best results, it's important to use paper that is made by the same manufacturer as the printer you are using. For example, if you have an printer that is made by Epson, you should use Epson paper.
You can check with local office supply stores or order the paper directly from the printer manufacturer.