This thing needs a thread of its own. Good to come across such ideasIn these cases I buy gold coins from Amazon with CC discounts. I usually get it at 5-7% less than market price(good brands like Malabar) and I sell it at Malabar showroom at 2% less than market price(their buyback policy).
So in short 5% profit+ milestone achieved.
Last/this month I bought 1lakh gold coins from Amazon using SBI cashback card. Got 10% discount+ 5% cashback. Sold it at Malabar showroom for 10k profit and 50% spend milestone also achieved. And much safer than Yaper.
But I only do it in Diwali sales and max upto 1-1.5 lakhs to avoid blocking of my amazon account or card.