What TV tuner usb "sticks" will work with my iMac?

My eye TV hybrid TV tuner stick got fried with lightning strike this past summer. What usb tuner sticks will work with my iMac. When I bought the eye TV Hybrid, I believe it was about $70 - $80, but now I see they are not available to purchase direct from the manufacturer in the US, and the only ones I find on the internet (primarily Amazon and E-Bay), are $200 - $300, and I am not going to shell out that much I would rather buy a new flat screen TV, and hang it above my computer station. Has anybody any info that would help me?