Send them to UK first. Then use another company for shipment to Bulgaria. UKtoBG is a nice company. they charge 1.80lv per kilo for shipment . Shipment to UK was 187$ with Shipping (Priority Mail International) option. The other option was Fedex 450ish dollars. Of course there will be TAX 20% on top. And actually that shipment is also with Fedex may be a bit slower.

Happy mining. BTC