Heard this on a podcast ( MKBHD's Waveform ) ( was just an Advert via spotify )
15% off First Purchase at Altronics instore. Just mention the discount 15% spotify podcast to the cashier.
Not sure how they can tell what number your purchase is so should be good to use.
No terms were mentioned on the AD, and can't find any reference to it online.
More info
Assume It was a Advert that spotify put in the middle of the podcast, the ad was talking about how Altronics has been around since 1976 servicing for 44 years. The it mentioned about the discount at the end.
God Speed