Are there only the 2 of you going?
If so, the VEA shuttle costs 16 euro per adult each way, regardless of which time of the day, or day of the week, you use it.
The other option is the TGV high-speed train. Fares for this start at around £11 per adult each way, but fares vary depending on which time of the day you'll be using the train (ie peak fares cost more).
There are links to both these modes of transport on the "useful information" sticky on this forum.
Hope this helps,
Elaine