I was just working on this very problem two days ago.
I love Show Sheen, but can't afford it anymore. I think someone recommended Infusium, so I was looking at it at the drug store. Right next to it was the Mane and Tail conditioner, and it was actually less expensive per ounce than the Infusium. So, I bought a bottle, but haven't used it yet.
Anyway, I think Mane and Tail is fairly inexpensive.