Sony has produced a series of CD/Cassette/AM/FM radio systems, some of which should be under U$ 150. With the detachable speakers and 8 D cells they are a bit heavy to carry around, but the speakers do come off and even with the batteries installed it is more transportable. It has an AC cord so if you are near an outlet you can just plug it in and avoid the weight of the batteries. The system is sold as a coffee table sound system and it does this well. If you were going to record stuff you value I'd use an external mic so as to get somewhat better quality.
My system is a CFD 577, which indicates that it incorporates a Cassette recorder(1 recording two playing decks) FM/AM Radio, and CD player, and is model 577 of this line.