As menting (www.spulen.com) has disappeared from the market I looked for 
an alternative supplier in europe.
I discovered feryster.pl who offer a wide range of cores and bobbins.
And the claim to serve DIYes as well.
So I tried to order on-line some bobbins but failed in sending the 
registratin form required for first time buyers.

Can anyone comment on feryster.pl?