I buy mine on eBay usually. Look for mix 31, it's modern and works at HF and VHF. The ones I'm using on J-poles came from an eBay vendor in England.
J-poles work fine without toroids (though some RF comes down the outside of the feedline), so don't delay building J-poles just 'cuz the toroids haven't arrived. When they arrive, add them.
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-- Carl
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