Well, having done some research for an upcoming trip to Spain.
1. The EVOC bags are really nice.
2. But, yes, they are many, many £££. Yes, you can find 2nd hand ones on Ebay that people have bought to go on holiday once with, and then tried to sell on, but, you’ll probably not be saving that much, as they will want a maximum return for their outlay, and you’ll be in the middle of a bunfight with other bugger trying to get it.
so..
3. What about hiring one ? The lovely people at 18 bikes have a couple.
http://shop.18bikes.co.uk/products.php?mode=search
Now the only reason I didn’t take them, was because I’m just that bit too far away to collect, and it was going to be too expensive to courier. If you’re nearer then it may be an option.
or, another alternative.
http://bikeboxalan.co.uk/
HTH