Topband: Ferrite Cores

[Hugh Valentine]

K9YC touts the benefits of the 2.4" O.D.  Mix #31 Core.
Anyone know a good source?
I bought a hand full from Arrow last year, now theirs are on back order.
Other sites seem pricey.

Anyone have good inexpensive(relatively) source?
Thanks
Val
P>S> The Bird-feeder needs some sprucing up and thought would try these on her.
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