Well, in most grammar books I see ください
but I have seen 下さい as well.
Here are some signs from Japan. (I take photos of strange things!) people may also be interested to try to read what these say.
a bridge in nara (and why isn't suwaranai 座らない ? )
in a minsyuku's ofuro
Both using 下さい
Part of a rubbish collection schedule using ください
(You could make good comprehension questions from this one. When do you put out the non-combustable trash?)
Don't know what this is (hope it isn't dodgey
). But you can see 下 used in kudasai and shita(?) (I was actually taking a photo of something beside it) Interesting that yen is in roman letters instead of 円
And a penfriend of mine uses 今日は sometimes and sometimes こんいちは
They also use 沢山 for たくさん (swamp-mountain!)
Where I've also seen 良い where I'd think いい
it could just be hitting the space key and accepting the computer's idea.
mind you no-one should use my english spelling as a model.