Need to know the weight of the package. And which area of Spain (most of in the Zone 1, some in Zone 2, and some islands in Zone 3).
I use the International EMS express post service of the Hungarian Post company (Nemzetközi EMS gyorsposta).
When I sent machine + PSU then it is about 3.5 kg. The up to 4kg price to Zone 1 is about 44 euros, to Zone 2 about 50.
5kg prices: 47, 54, 6kg: 51, 58
Other companies have a higher prices.