Hi you could try An Stor Tourist Hostel Midleton they cater for families, couples individuals & groups of all ages it can accommodate up to 48 people.
Prices are Single room €22
Groups 4 people + €15 per person
Breakfast can be provided on request
You are only 15 minutes away from the beaches.
The Hostel is in the centre of Midleton Contact Aisling Tel 021 - 4633106
http://www.anstor.com/