$300 will get you a new Boss DR-670. It's a stand-alone, doesn't require a PC. You will need, however, something to play it back through - headphones, your stereo system, etc. It can store a maximum of 100 songs with 250 patterns per song (I just composed a three-minute song that consisted of only 9 patterns, so patterns can go a long way.)
This may be more than you need. You can probably pick up a used one for close to your $200 requirement.