I did it exactly 3 years ago. The original/RSP price of the 2013 MacBook Pro Retina I wanted at the time was $1499. Best Buy had them at $1399. I used the student deals coupon and got an extra $100 off. From what I've read, the policy is still the same, but they reserve the right to not let you. I think it'll depend on the attitude of the sales person and/or manager. Just go in and ask nicely.
I'm thinking about selling my 2013 and taking advantage of the deal myself since it's my last year as a student. Let us know if it works out.
Way back when (I want to say this was 3 years ago), Best Buy wasn't having a sale on an iPad I wanted but there was a lower price available from another store. So I had Best Buy price match that, and they still took the student coupon as well as the old Mover's Coupon (that I believe they don't give out anymore) and $20 in Reward Zone coupons. I ended up walking out of the store with a $600 iPad before tax for $329 with tax.
It may have changed since then, but I know the employee didn't care the system didn't bother to confirm eligibility. It just took it. It's worth a try, but I know their system have gotten better over the last couple years. Stuff like this may not work anymore.
I don't think the mover's coupon still exists, but there are BB 10% "birthday" coupons floating around there, but they typically exclude laptops.
A few weeks ago, there was both a $100 and the (current) $125 off MacBook coupons that overlapped in valid dates, and you could stack them in store. I did it myself, and was checking out when I realized my wallet was MIA, and I ended up being out of town the rest of that week.
So, there are actually now two different sets of the $125 off MacBook BB student coupons, but it is unknown if they'll stack in-store. Non of the 13" TB MBPs are on sale this week, so I haven't attempted to try them in store.