how much do chickens cost /best ones for most eggs

[Bonnox]

Some ex battery hens won't lay, they are 'ex' for a reason, a lot are because they no longer lay, yes some are rescued and will be still good, but check with the charity first, I got my warrens for £9 each and as a general rule of thumb in ideal conditions you will get about 300 eggs a year, mine lay about 6 a week then have a rest day.
There are plenty of we pages about which chickens lay how many eggs, but warrens are the most common and easiest to keep they are the ones that everyone thinks of when you say chicken the red brown birds, they are also very friendly