HP, Dell and Apple distributor Renaissance are understood to be among those shortlisted to win government hardware contracts worth tens of millions of dollars.
Telecom's information technology services arm Gen-i is also rumoured to have bid in conjunction with Chinese manufacturer Lenovo for the contracts, through which agencies can buy computer hardware and office equipment.
Economic Development Minister Gerry Brownlee is due to announce the contract winners in the next two weeks.
Departments are required to move to the contracts as soon as possible and before July 2012.
Agencies in the wider state sector such as school boards of trustees will be encouraged to purchase through them.
The Cabinet has estimated $58 million will be spent on the computer hardware contract in the first year, and $18.5m on multifunctional devices.
Hardware suppliers have bid to supply desktop computers, laptops, tablet notebooks, multifunctional devices and laser printers to agencies.
Gen-i spokeswoman Carmela Salisbury says it is unable to comment because of a confidentiality agreement.
Brownlee has said the all-of-government contracts will save more than $115 million over the next five years.
Corporate Express and OfficeMax have won the contract to supply agencies with office stationery.
Cabinet has instructed the Economic Development Ministry to investigate other categories for which government-wide purchasing contracts could be negotiated, including ICT hardware such as cellphones, mobile voice and data services, data servers and utilities, such as electricity.