not much
"Greek slaves didn't cost too much money, we do not know how much, but if almost everyone had one, then greek slaves wouldn't cost too much."
No they did not
Helots
If you read House of Dies Drear by Virginia Hamilton, it will tell you exactly how slaves used the Greek Cross.
Yes, of course. However, slaves probably did not eat as well as their owners.
abolitionist
Done by wives and slaves.
Assuming you mean `Sparta´, the ancient Greek State, the slaves there were called Helots.
usually slaves didnt posses money. but depending on where they are from, or put into slavery they use local currency if any. like Persian slaves would have to use greek currency if enslaved and given to a greek.
men that weren't slaves.
slaves only ate one or to very small course meals a day