I own a sports bar and want to put all receivers together instead of at each tv. Where can I find this type of switch.

if all your tv's are up now on DTV, you do not need a switch, You need to move them. Which means you need to pull cable and reroute lines. Thats a whole day job most of the time.
If all your tv's are not at this time on direct, you do need a switch. You need to know how many LNBF's are on your dish, and how many tv's you will be running. That will tell you what type of switch you need.
Then once you know that, look on ebay, ask a local Tech. or e, me at dishrodger@yahoo.com