Firstly you should remember that stamp duty will not apply to the first €125k of the house you would buy and only at 7% for the remainder. Without knowing what part of Cork you live in or want to move to, a quick look on myhome.ie showed a number of bungalows available for €250k-€300k, meaning your overall stamp duty could be less then €10k. Remember as well that a new house may be exempt from stamp duty.
There are grants availble which may help you upgrade your home, I've attached some URLs from the Citizens advice bureau.
Thanks for that. The last move must have cost us about K€30 after paying stamp duty, Estate agent fees, Solicitor for selling last house and buying this one, bridging loan etc.