I am not familiar with the Echosat V3000, but here are some steps you can take before getting another receiver. First, you need to find a program called a loader for your receiver. This will allow you to enter keys either manually or through the internet (I am assuming this has a cat-5 connection). If you don't have a USB slot, you can usually upload the software via an RS-232 cable in the back. If this is successful, you should be able to purchase a dongle, get keys through a cardsharing site or even manually enter keys through your remote.
If those aren't options, do a search for dreambox on here and you will find the name of a reseller. Even with the receiver, you are still going to find a cardsharing site.
As for cablevision, it doesn't have all of the JSC channels
If those aren't options, do a search for dreambox on here and you will find the name of a reseller. Even with the receiver, you are still going to find a cardsharing site.
As for cablevision, it doesn't have all of the JSC channels