This week not much stuff to spend on. You can consider buying command flags in summer memories event: 5 summer packs for 100 coupons = 5 frags -> 2000 coupons for each command flag. Or charm packs : 20 per heart (christmas pack), 1 decoration per 2-4 hearts, i think approx 300 coupons per charm pack (+other stuff like minato frags, epic runs, pots etc).