Steve Rawlings wrote:

To Everyone:
Many LFers in Europe and elsewhere have found local companies
that sell 3c85/3c90 ring cores, and I would be happy to update my
web-site with details of companies that sell these ring cores in
small quantities: Please Email me direct with the details!

Barend Hendriksen HF Elektronica BV used to sell Philips ferrite cores
with international shipping.  Look at :
http://www.xs4all.nl/~barendh/Indexeng.htm

I have never bought anything from them, so cannot speak
about the quality of the service.

73  Alberto  I2PHD