cheap way to get to Nante(170euro)

Have booked accomadation and travel for 170euro for this weekend,it will mean a bit of a drive but for 170euro its worth it,see below
Lads

All booked:
Friday
Rosslar - pembroke
08.45-12.30............................................. .........246euros
rtn

Folkestone-calais 20.00-21.00
.................................................. ........183poundsrtn
Drive for about 1.5 hours booked Formule1 hotel
Rouen.EST.........................2 rooms at 23.50euros per room per night
(11.75 each)

Sat about 3.5 hr drive
Sat & Sun.............booked F1 hotel
Nantes.EST.....................................2 rooms at 26euros per night
(13euros each per night)

Mon 6hr drive
Calais 17.00 back for 18:00
pembrook/Rosslare leave Tues 2.45am

Tues
Arrive 6.30
Cork about 9.30

Price for ferry and train are for 4 people