How I can get a cheap iPhone?

Visit the apple store and look for a refurbished phone. Its used and much cheaper than buying a new phone and also comes with a 1 year limited warranty.

Check this out:

https://www.apple.com/shop/refurbished

Hope this helps.

Apple has always been expensive, and the refurbished units are cheaper and affordable. If you still find them expensive i would suggest don’t buy it used from someone, save some money and get it from apple. At least you will peace of mind that it is authentic. :)