Airport Transfers with Bike Boxes

Hi All 

First time poster so please be kind if this has already been answered. 

My Freind and I have just booked up again to come across for some sring training and cycling and wondered if there is an alternitive to the airport transfers that are advertised. We always self tour rather than going with a group as we like to be more in control of the pace and route etc which as much as this provides more freedom we do miss out on some of the perks. 

For example last when we came across the transfers took well over 2 hours and cost a fair amount of money and we got to thinking if there was a local service which was a similar cost of £60.00 - £80 round trip which got us into our accomadation a bit sooner with less agrivation?

we looked into Rental cars as we both drive in spain regulary however the prices were rather steep. 

I have looked into private transfers however these range from £150 to £200 just because of the bike boxes. 

If this is the only options we will just have to bite the bullet, however if there was a more localised service that meant it was a more affordable or more efficient I would be greatful for the help. 

I appriciate that might be a common question, but any help or nudges in the right direction would be really helpful. 

Kind Regards 

Matt