The 1,000-plus cash machines being sold are largely based in retail outlets, and represent more than a quarter of all cash machines in the country.
There are currently around 3,000 ATMs owned by banks, and another 750 owned by independent providers.
There are worries that rural areas will be the big losers. Consumer groups say companies that own ATMs independently of banks are likely to impose charges and fees for using them.
This would be in addition to the fees imposed by banks for withdrawing cash from an ATM.
Bank of Ireland charges its customers 25c for cash withdrawals, with AIB charging 35c unless certain conditions are met to avail of fee-free banking.
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