There's a rental shop in Ranelagh (sorry can't remember the name but its on the main street) but like Dobber22 said, why rent when you can buy a perfectly good 21inch tv nowadays for just €130 (at least I did in Power City)!
Thanks for the advice. Ye've persuaded me to go out and buy a TV. Does anyone know what newspaper I could get today that has a Powercity ad in it, as their website if fairly rubbish?