OP, I use a Citi, now NAB, card from Australia and the exchange rate for AliExpress purchases is reasonably close to to the bid rate on XE. As said above it should only be 2-3% from the mid market rate. But that could vary depending on your bank.
All of the above posts in support of the fisherman? Try doing these things in Australia. You will be fined for being in a boat without a fishing license. Don't dare take a piece of washed up seaweed off the beach to use as garden fertilizer or you will be fined as well.