I'm trying to make a Switch Mode Power Supply and i have the schametic ready. But like a SMPS, the transformer must be custome made or hand spun by yourself. I need to buy a bobbin and a ferrite core but I can't seem to find any retailer to sell it to me in small numbers. All I get are big companies with quantity limits of 1000. I've searched all over google and found nothing. Anybody know a retailer that sells bobbins and ferrite cores?