Would someone please explain to me why TNC connectors are so expensive. I just had my 430 upgraded to WAAS and now need a TNC connector for the antenna. I checked with several sources and these connectors are averaging around $26.00 and up each. I searched on Ebay and saw an auction for a bag of 100 TNC connectors for RG 58/RG400 with delrin and gold plated center pin, crimp type for $25.00 plus shipping. I really don't need a 100 of these but, this is a far better deal than buying one connector for the same price. What is the difference???