There are a variety of different reputable barcode resellers in Europe that can be seen below. These are members of the International Barcodes Network, and their barcodes include registration in the International Barcodes Database. You can purchase barcodes from one of the sites below, or else from International Barcodes:

Armenia barcodes.am
Austria barcodeoesterreich.at
Azerbaijan azerbaijanbarcodes.com
Belgium codesabarres.be
Belgium barcodemaken.be
Bulgaria barcodesbulgaria.com
Bulgaria barcode1.bg 
Croatia croatiabarcodes.com
Czech Republic barcodes.cz
Denmark stregkoder.nu
Estonia barcodeestonia.ee
Finland finlandbarcodes.com
France codesabarres.fr
Georgia barcodes.ge
Germany barcodedeutschland.de
Greece barcode1.gr
Hungary hungarybarcodes.com
Ireland barcode1.ie
Ireland buybarcodes.ie
Italy codiceabarra.it
Kazakhstan barcodes.kz
Kyrgyzstan barcodes.com.kg
Luxembourg codesabarres.lu
Malta barcodes.com.mt
Netherlands barcodebestellen.nl
Netherlands barcodenederland.nl
Norway norwaybarcodes.com
Norway strekkodernorge.info
Poland kodykreskowe.biz.pl
Portugal codigos-de-barras.pt
Romania coddebareromania.com
Romania cod-qr-romania.com
Slovakia barcodes.sk
Slovenia sloveniabarcodes.com
Spain codigos-de-barras.es
Spain – Catalonia codisdebarres.cat
Sweden kopastreckkoder.se
Switzerland barcodeschweiz.ch
UK buybarcodes.co.uk
UK barcode1.co.uk
UK barcode1.uk
Ukraine barcodes.com.ua