I bought Superion last week @ the $39.99 "sale price", then later found out about the upcoming 30% (and also forgot about my SPC). D'oh! Regarding price adjustments, I have some bad news and I have some good news.
First, they re-upped the price back to $49.99, but I was able get the 30% adjusted plus the 10% spc [they asked for the card plus student id]
Last week ($39.99+tax): $45.19 total
Today $49.99(reg. price) - $15(30%) - $3.50(10% of $35) + tax: $35.58 total
In the end I saved another $9.61. Meh, moral victory I guess. Hope that answers some questions