Canvas; Canvas giclee images are exact size and are ok for mounting without glass or matting if desired. They should be stretched, dry-mounted, or glued(preferably using acid free products) These methods will make it easy to mount the images to a frame. Many very affordable ready frames are available almost everywhere these days. The downside of this method is the giclee is exposed to the environment and it will shorten the life somewhat. The up-side is the image is better seen and looks very much like an original.
100%Cotton paper; Sometimes called "rag" paper since the first cotton paper was made out of rags. These images are also exact size but they MUST be framed under glass and preferably matted. The up-side of this method is the print is protected from the environment and will last the longest time. The downside is obvious, the glass is a layer you have to see through to see the image.
Both these methods is something you can do yourself with a little effort.
Small paper prints are shipped flat, all others are shipped in tubes.
Place a little weight (like a book) to flatten prints that want to curl up a little
Shipping is usually U.S. Postal and free to you,you pay for return postage.