www.newegg.com has the best deals on most things, im sure you could find something on there. I got a 8x DVD burner for only 110 dollars. Seeing as thats newer technology than a CD-RW im sure you can find something decent for around 50 bucks.
you can find decent cd-rw/r in stores for less than 50 with mail-in rebates... i saw one for like 20 dollars.. (52x34x52x or something like) even a 52-34-52 + dvd for like 65... i was at circuit city earlier today when i saw this..