Most KJVs are double column on each page. Several KJVs are single column on each page.
Some are KJV Thompson Chain Reference, which was the only KJV TCR at the beginning. I do not recommend anything else than KJV. The TCR is the work of several men and has value as a Bible-plus-concordance (word studies) put together.
Super Giant Print is the largest font - the one I use on the lectern.
Giant Print is large but by no means giant.
Some Bibles are smaller so the fonts are smaller and compact. That kind is more portable but less readable for us older readers.
Bible covers have a great impact on the cost of a Bible.