Bike transfer Geneva airport to Chamonix

Hi
Does anyone know of a reasonable transfer company or other solution to transport 4 cyclists with bike boxes from Geneva airport to the Chamonix area, and then back again a week later....early June this year.
So far we are being offered very expensive options (480 euros which seems a lot to me), or emails get no response, perhaps because this is fairly early season for the Summer and all operators are in ski mode right now. I have looked at train services but none work to our schedule.
Would be grateful for any advice.
Thanks
Does anyone know of a reasonable transfer company or other solution to transport 4 cyclists with bike boxes from Geneva airport to the Chamonix area, and then back again a week later....early June this year.
So far we are being offered very expensive options (480 euros which seems a lot to me), or emails get no response, perhaps because this is fairly early season for the Summer and all operators are in ski mode right now. I have looked at train services but none work to our schedule.
Would be grateful for any advice.
Thanks
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Train GVA - Chamonix (Hourly IIRC)
But the problem is timing. The train to Chamonix does not run early or late which makes transfer to or from the airport a problem ... a function of flight times. Any other ideas?
http://www.skiidygonzales.com
May be worth sending them an email for what its worth. Guessing that summer prices may be higher than winter due to decreased demand. Tend to drive out for the summer (Morzine) and find it not too bad a journey.
On a positive note they have referred us on to a local van company. No word from them yet. I will post again if we succeed.
Tricky problem. It seems difficult to arrange transport for what is only a 90 min drive at most. It does not help that we are going fairly early in June. But the big stumbling block is the bike boxes.
I have 5 months to sort this out I guess. Any other ideas gratefully received. Thank you to all who have contributed so far.
I suspect that there are businesses that do winter transfers who haven't got nearly so much to do in the Summer, so worth trying.
A company known as Cham-van.com have offered to transfer the team of 4 with bikes, door to door in Servoz for 150 euros each way. All I am fairly happy this is a reasonably good deal.
We are attempting a circuit of Mont Blanc over 4 days through Switzerland and Italy. This is the last link in the trip.
Looking forward and thanks again