shall I buy vs do you want me to buy

Some examples from the web:

• Shall I buy you something, Father?
• Shall I buy you a ticket for the concert?
• By tomorrow I shall buy you a glass of the finest wine.
• Tomorrow I shall buy you six dozen red roses.
• If I ever come into a fortune I shall buy all little birds.
• Once we are settled, I shall buy her a puppy.
• I shall buy a hat and a ribbon and a frock and shoes and a petticoat.
• I shall buy this sword, how much do you want for it?
• And that is why we shall buy her.
• We shall buy this place and fire you immediately.
• We shall buy the plans if you will undertake to disengage your troops in America.
• The intervention agency shall buy at the intervention price and at that price only.
• The intervention agency shall buy in the sugar only if it is offered by:
• 1. Pursuant to Article 9(1) and (2) of Regulation (EC) No 2201/96, the storage agencies shall buy in:
• 1. The intervention agency shall buy in the sugar only if it is offered by:
• 1. During the period from 1 April to 31 July the intervention agencies shall buy in the quantities of paddy rice which are offered to them provided the offers comply with conditions, in particular in respect of quantity and quality, to be determined.
• Intervention agencies shall buy in at 80 % of the reference price fixed in Article 3 for the marketing year following the marketing year during which the offer is lodged.
• Once the Commission has noted that the condition referred to in Article 2(1) is fulfilled in a Member State, the intervention agency concerned shall buy in butter in accordance with this Section.
• During the period from 1 April to 31 July the intervention agencies shall buy in the quantities of paddy rice which are offered to them provided the offers comply with conditions, in particular in respect of quantity and quality, to be determined.
• When shall we buy the presents?

Some examples from the web:

• Do you want me to buy you medicine?
• Do you want me to buy you a rocking horse?
• Look, - Do you want to buy me out or not?
• Look, do you want to buy me out or not?
• Do you want to buy me breakfast or not?
• What do you want me to do, buy her flowers?
• No, I don't want you to buy me a hat!
• Do you want to buy lottery tickets?
• Do you want to buy some toothbrushes?
• You want me to buy some of your famous diamonds or... No.
• Do you want to buy gift after dinner tomorrow?
• So, how much weed do you want to buy?
• Do you want to buy my dream?
• Do you want to buy any sunglasses?
• Excuse me, do you want to buy vegetables?
• Do you want to buy the pit that neighbours yours?
• Do you want to buy a Chunah's painting?
• Do you want to buy a carpet tomorrow?
• Do you want to buy yourself a place in paradise?
• Do you want to buy the farm with me?