Lukasz: hello! Is the offer still available?
Ola: hi! Yes, it is! Are you interested? 
Lukasz: Sure, it looks nice :). How much is it? 
Ola: As in the advertisement, the price is not negotiable
Lukasz: That's a pity, if it would be a bit cheaper I could take more
Ola: You know what - let's do this way. If you take 10 pieces, I will give you one extra
Lukasz: That's kind of you. In that case I will take 100 of them :)
Ola: 100? Are you for real? That's great, but I don't have so many. You will have to give me some time to make new ones
Lukasz: How much time do you need?
Ola: Let's say...I could be ready in a week, is it fine?
Lukasz: Yes, next week will be great. What about payment? 
Ola: Normally it would be cash on delivery, but since your order is so big I will ask you for payment in advance
Lukasz: Partial paymenet would be ok? 
Ola: Yes, 20% would ensure me that you really want it
Lukasz: All right then, send me your bank account number and I will do it right away
Ola: Here you have it, I will start right after I get the transfer
Ola: <file_picture>
Lukasz ordered a hundred pieces from Ola's offer. Lukasz will pay partial payment of 20%, so Ola can start working.