An inflation-busting tax-free savings account is on offer from National Counties Building Society.
Since National Savings and Investments withdrew its index-linked products in July, it is the only savings account currently on offer with an inflation guarantee.
The five-year ISA pays 1% annual interest alongside the change in inflation as measured by the retail prices index (RPI).
The product is open to both new savers and those wanting to transfer money they have built up in ISAs in previous years.
But people must deposit a minimum of £5,100 - the whole of this year's ISA allowance - and they cannot add to the money during the term of the investment or withdraw their cash.
Under the terms of the product they will receive interest of 1% a year plus September's RPI change.
If RPI remains at its current rate of 5% this would give an annual return of 5.82% on an AER basis.
Even if RPI becomes negative, as it was for much of 2009, savers will still receive a return of 1% a year.
The product will be available until September 30, however there is limited availability so it may close sooner if demand is high.
