Any caliber which uses 'a lot' of lead (big bullets) will cost more. Bullets are the major expense when it comes to reloading.
As far as 'easy', like he said above the 38/357 is easy. The 9/40/45 are not 'hard' to reload, but because they head-space on the case mouth they do take some getting use to.
An armed society is not always a polite society, but it is a free and safe society!
Self Defense is an absolute and natural right!
Keep your head down and your powder dry!