I purchased an used GPU from this guy Rohith (https://aprorigs.com/). Even though their website only lists pre-built PCs but on enquiring via call he does have new/old parts available in shop. The price was very competitive for the card which has around 1yr warranty remaining.
He volunteered to show card's benchmarks and game tests. The shipping was done on same day of payment via DTDC Air, so no issues in that, plus DOA assurance.
