I have an Echostar 4000 with what they now call the Dish 300 dish, the system is four years old. I have the dual LNB because it came with the model 4000 receiver which I bought for the RF remote, I only have one receiver. I called Dish network, they quoted me a price of $75 for a replacement LNB (for a single LNB, not a dual LNB). But before I spend $75 on a new LNB, I would most likely just cancel my service and sign up with Direct TV (and get a free new receiver and dish). But, before I do that, are there any cheap ways to get a new LNB for my dish? If I buy a replacement LNB for the Direct TV system, will that work in my Dish Network dish? Is there a market for used LNBs? Thanks!