Hello and welcome to GH!
I'm actually ordering 62g springs (and some other stuff) to put in my ergoDOX (with clears)! I have it all soldered up and working except the switches, and I'm excited to finally get it done.
The ergoDOX is indeed a great keyboard. There are some members here who just rave about it! I would say it's a good keyboard if you can type "properly" which I still can't (at speed) but I plan to properly fix that with my ergoDOX!
Photekq is right: you can get springs from sherryton at origintiveco. There are other places as well, of course. Good luck with your ergoDOX.