If you're buying a tea/coffee & using your own cup, you'd pay full price minus .10 for your own cup & minus your TM disc if you're in a Spot SB. Your refill (same day) would be .50, minus the .10 for own cup & minus TM disc which works out to .36 before tax &/or redcard disc.
So, even if they're not giving you the gold card treatment, you should still only be paying chump change for a refill (kinda what spot pays us, in other words).
If it's a TM who "doesn't see where it is", after they hit "coffee" the refill button is in the bottom row in the middle. After it's hit, there's a red box in the lower LH part of the screen that says "coupons". If they hit that, it's the second one - "own cup".
In the meantime, I'll see if I can find the info link.