If I remember correctly, you were looking for a cheap rig before (Superlux or similar) so I'll assume you are on a smaller budget.
Sonic Studios makes some great tiny mics for clipping on your glases, but for them and the battery box it's upwards of $800. I have a set of SS DSM-6S's that I love and stealth right into my Sharp MD recorder with no battery box and have gotten good quality recordings.
http://www.sonicstudios.com/dsm.htmNext up would probably be Core Sound or Sound Professional mics. I've owned both and love the SP AT853s I have. They're pretty stealthy, but Sound Professionals also makes smaller versions that I think use Panasonic elements and I'm not sure how good they are. They have some clearence mics on both sites where for probably about $100 you could get a decent set...but I'd say $250 is a ballpark price for a good set and battery box.
http://www.core-sound.comhttp://www.soundprofessionals.comNext up would be Church Audio...I've never owned anything or even heard any recordings made by them, but I hear they're pretty good. He is a board member here and I think if you go to the gear loaner section of the site, I think there's a set there to play with. I think he sells tiny stealth mics in a Croakies mount for about $150 on eBay.
After that, I'd say Giant Squid mics that I've never tried but hear they are decent. Search on eBay as the company always sells stuff there. You should be able to get a set of cards and battery box for a little over $100.
When it comes to stealthing shows there is no clear answer. You can get some DPA mics for a couple grand and run them into a Preamp stuffed down your pants and a Phamtom power supply in your boot and an A/D in your hat....you can get carried away very easily and my idea of stealth is different than a lot of people. Some people's stealth setups are larger than my open setup.
Also keep in mind that stealthing a show is a pickier taping science requireing you to get in the sweet spot, avoid talkers, stay still, look straight ahead the whole time, etc. A $30 T mic in a MD recorder could get you a better sounding recording from the sweet spot than a $3,000 rig in the nosebleeds with screaming teenagers surrounding you and a drunking hitting you in the head where you have the mics.
I'd say make your choice based on your budget and then experiment and see if you want to upgrade in the future. Good luck