Just go for the standard delivery. I've just gone on Eurosender, put in UK to UK, length 129 cm, width 19cm and height 50 , weight 10 -20 kg and its come in at 15 euros, add the insurance if you wish another 12-15. I've sent 2 basses via Eurosender in the last month to UK addresses for less than £30 each insured for £1000. One took 2 days, the other arrived the next day after collection, both by DPD. Oh and there's the Basschat discount which takes around a £1 off the price too. Both my Basses were in hard cases too. They load the next day delivery price hence your high quote!