Mind-melding beats aren’t the only thing dropping in Brooklyn. When our team last reported on ticket prices to see Tame Impala’s four ‘Deadbeat Tour’ concerts at the Barclays Center — which take place Oct. 27, Oct. 28, Oct. 31 and Nov. 1 — the lowest price we could find for any one show was $129 including fees on Vivid Seats. Now, just six days later, prices are plummeting. At the time of publication, we found tickets going for as low as $87 including fees on Vivid Seats for the quartet of gigs.