Looking for this special RJ45 modular connector so I can terminate my own cables

They're generally called "EZ-RJ45" ends. I find them to be a pain in the rear. They require a special crimper that cuts off the excess, and even when brand new and sharp, these crimpers do an inadequate job, requiring me to use an angle cutter to snip off the remaining pairs one-by-one, thereby negating any time saved by not needing to worry about cutting the pairs to the correct length.

Figuring out how to crimp RJ45/cat5e jacks the real way is not difficult. Do five or six of them and you'll have a good feel for how much length you need to leave to get good conductivity to the pins as well as allowing the sleeve to extend under the plastic crimp in the jack.

I need to say, though, that this is a classic case of being penny wise, but pound foolish. You're asking for trouble by making these yourself. You'll likely be using solid-core Cat5e (or Cat6, whatever). This type of cable is not meant to be used for anything but wiring patch panel to patch panel. When used in any situation where the cable will get moved, brushed up against, etc., you will have cable failure, and it will be very annoying to troubleshoot. Additionally these cables will not have anti-snag boots.

Just purchase a good variety of lengths of pre-made patch cables with anti-snag boots. You'll thank yourself for making this decision.

These might be what you're looking for:

http://www.homedepot.com/buy/electrical/voice-data-communications/platinum-tools/ez-rj45-cat-5-connectors-50-pack-67870.html