Good luck man. There is a post on this forum from last year and the member said this:
"I called labsmd once and they said they dont do coupon codes much or at all. ,,but i did notice privatelabsmd usually has 15% off most months.."
I think Privatelabsmd also has Stan Efferding as a client and you can use his code "RHINO". I might be wrong though, so please don't hold me to this.