setup multiple inputs into coax only tv?

Factual Questions
#1

I have a friend who came to me and asked if I knew of a way to setup his old coax only tv to allow input from multiple sources. I think (for example he has a ps2 and wants to of course allow his cable tv also to run on the television. I thought for sure I’d be able to find the equivalent of an A/B switch to allow the user two switch from various inputs.

I suggested he buy a cheapo receiver. Any better / cheaper possibilities?

#2

Look for an rf modulator. Some of them allow more than one source that you can switch between. Shouldn’t be more than $30-$60.

#3

Something like this?

http://www.amazon.com/Parts-Express-Coaxial-A-Switch/dp/B0002ZPIQ4

Or these -

http://www.google.com/products?q=coax+switch&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&ei=qtbwSd_HKsertgfyoZmsDw&sa=X&oi=product_result_group&resnum=4&ct=title

Cheapest one is $2 but of course shipping will probably be more than the switch. If you have radio shack stores in your area they usually carry this sort of thing.

#4

Useful gadget from walmart.