follow-up
I like Tron's idea with the stacked LNBs.
You would need an appropriate switch to go with it, and the Dish DP34 would be a cheap solution.
I've picked them up for from free to $20, with $10 being about average.
It would give you capabilities of up to 3 LNBs, feeding up to 4 receivers.
Those LNBs have been discussed here, so there's plenty of information on using them.
Oh, and some receivers just know how to talk to them without any trouble - what receiver do you have?
The other clever idea was to get the two-output LNBs from old Primestar dishes.
Those have V on one output and H on the other.
While you could combine 'em with two 2x2 or 2x4 multiswitches, it might be even easier if you used a 4x4 switch.
Then, 22khz off and 13/18 v would select the two polarities of one LNB, and 22khz on with 13/18 v would select the other LNB.
This idea has also been discussed with diagrams here recently, but we can find you a picture if it'd be helpful.