Should it be “with one click” instead of a click in order to stress only one click, not two or three clicks.
See yourself how internet baking saves ‘your’ money in so many ways – typo.
I think "with a click" is correct b/c I would imagine that it would take more than one click of the mouse to achieve any of the results that they list, so they wouldn't want to specify *one* click.
Also, "saves you money" is correct, in my opinion. I'm not sure if the written grammar is entirely correct as I'm not an expert on these things, but in speaking one would say "saves you money" as a shortened way of saying "saves money for you".