The provider has said that the investment product will again be available next month, however.
The Post Office has closed its latest issue of growth bonds, it has been announced.
Issue 6a of the savings products, which sees investors lending the firm money at a guaranteed payback rate, have now joined the Post Office's guaranteed equity bonds in no longer being available for purchase. However, a statement from the provider promised that the bond would soon be back on the market.
"You won't have to wait too long for our next issue, which will be available from Wednesday 1st October 2008," it said.
Growth bonds work by giving the investor a promise that capital invested will increase by a pre-set amount over the investment period.
The Post Office launched a Five Year Saver bond earlier this year, offering 5.5 percent AER over half of investors' cash, with the remainder to have returns linked to the FTSE 100 index.
Meanwhile, the "savings war" between high street financial firms, many of whom are seeking to restore their credit crunch-hit balance sheets through attracting customer deposits, has heated up still further, with news that Alliance & Leicester are bumping up their eSaver's AER to 6.56 percent - an increase of 0.06 percent from before.
For its part, the Post Office has also released a new tax-free Individual Savings Account at a table-topping 6.25 percent - an AER which includes a 1.5 percent bonus for all deposits made between now and next April, the Guardian reports.
The bonds that have been withdrawn are as follows:
Post Office 1 Year Growth Bond
- Post Office 3 Year Growth Bond
- Post Office 5 Year Growth Bond
We will be updating all of our members in our weekly email as soon as the new Post Office bonds become available, as they're likely to be limited issue and tend to get snapped up quickly. So, make sure you're among the first to know and sign up to our money saving tips newsletter.