Hey;
There are all sorts of good setups for going wireless on a didge, but you're gonna have a really hard time coming in at $500 or under unless you find used gear.

You can't use the same radio channel for both voice and didge, so you'll need two complete sets.
For **each performer** You'll need:

1) A mic that is good enough to handle the instruments
2) A transmitter pack - from the didge to the board
3) A receiver at the board end.

You can often get a deal on some sort of combo pack.

Here's a basic setup that would probably work well for your didge
www.sweetwater.com/store/de...7ASW4-U1/
...though I don't know how the battery life is on that mic/transmitter.

But you're already up to $400 + shipping for just one performer.
your partner will need a duplicate set.

Here's a used demo model from the same site www.sweetwater.com/store/de...05SCH5d1/
but I don't know the brand, or how good it will be with didge, or if it's even still available.

Also; On the didge, you'll need a way to mount the transmitter. You can tape or clip the mic into place on the bell end of the instrument, but you'll need access to the transmitter if you need to change batteries or transmitter channels. I use a little cloth bag that is zip-tied to the intrument.

Also, also, know that these things are basically meant for you to be wireless onstage. The farther away you get from the receiver, the less good your sound is going to be. With my Sennheiser setup, I have roughly 75 feet before it begins to cut out.

Also, also, also - remember that when you get in front of a big speaker, you run the risk of feedback. (Not what you want for a sound healing journey - be sure to soundcheck !)

Remember - whatever you get - bring extra batteries!

Good luck!

Jay