If you mean Irish, you will find a CD ROM at http://www.fiosfeasa.com
This is based on the published paper version, published by An Sagart, Maynooth.
You can probably get it from An Siopa Leabhair,
6 Sráid Fhearchair, BÁC 2, Ireland.
They have a Fax number too, but I don't have it here.
But it is a large (and heavy) edition, so the cost of postage is probably extreme.