ebay/parcelforce do anything up to 30 kg for 11.99 with insurance not much more on top (i think i got an extra £150 when i sold a Stumpjumper last September for £1.50) as long as you pack it well ~(goes for any courier/item) it will be ok.
My only reservation is Parcel2go/yodel, they lost and entire boxed bike and it took 4 months to sort out and get my insurance claim