Next Monday, the 31st of March is the closing date for the cheapest entries for the Cork City Marathon and relay. If you want to avail of this, you would really need to get those entries in the post today (...I posted mine yesterday just to be sure!! ;o)
Just go to the Cork City Marathon Website and follow the links there for an entry form. You can also enter online although this costs 10% extra.
For a bit more info, look down this page at the post dated the 13th of March.