Kate240sx

Hi, i'm new here, my dad owns a 1991 Lexus ES250 and for christmas i was wanting to buy him an aftermarket cd player because all he has is a tape player in there right now. so i went to future shop the other day (like best buy) and they told me that there is no kit for fitting the cd player in so it would cost a lot of money for installation since it would have to be custom done. i was just wondering what u guys have done if you have an aftermarket cd player in your cars. thanks! -kate