Go to Newegg.com
Select either a benq1620w, nec3520, nec3540, lg4163b.
IMO any of those drive will suffice.
Chose whichever one is on sale for the least amount of money.
Don't know if you'll get anything under $40 (although some of the above have been that cheap), but definately under $50.
Any of these drives should fit your need. One of the most important criteria is the media you are using. Cheap media typically results in poor burns, and short life. Excellent media has opposite results.
If you want more details on burners go to the benq / nec / lg forums.
If you want more info on media go to the blank media forum, or check out the Bargain Basement forum for good prices on excellent media.
But more important than anything else, read the info you can find in this forum. Everyone has there own opinion on drives and media, but it doesn't take long to narrow down the good drives and media from the pporer stuff.