I'm not going to recommend these because it sounds like cheap is the primary concern, but for others I'll say first and foremost that I'm a huge Monoprice fan. That being said, as a guy that runs a ton of ethernet, that there is a superior jack from Allen Tel. They cater to industry (so you usually have to browse ebay), and they are more expensive (25 cents a plug rather than 6 cents per plug from Monoprice). What you get in return though is a much better designed plug. Event hough its smokey color the plastic is highly polished, so its *very* easy to make sure your insertion depth is deep enough and that all your colors are properly lined up. The entrance to the plug is angled and contoured to guide the wires in with extremely little effort and without worrying about wires turning inside the modular plug. You also get better, wider contact on the cable on crimp down without a sharp blade.
Monoprice makes good stuff for sure, but the Allen Tel modular plug is leagues better to use.