Normally if you purchase micro sd cards, don't accept the face value. You can almost always negotiate the price. But as the others have said, do your survey and market price online first.

I just bought a GoPro Hero5 at SenQ at $1849. I know I can probably get it cheaper online, but I'd willing to pay the extra for getting the product intact. As for the micro sd, since I know SenQ doesn't negotiate price, I went to Fotokem outlet nearby and ask for assistance. The shop assistant was very helpful with my gopro even though it wasn't purchased from his shop, and helped set up everything from the battery, the startup, the settings, the registtration and the apps manual in my phone.

From then, I decided to buy a few accessories from him and asked him the best micro sd for my gopro. He told me to get the sandisk extreme which is the most expensive, but also reason out why. For me, a salesperson who went the extra mile to teach me about product shows that he knows about the thing and has genuine interest. The initial price he showed me was pretty much around RM390 for a 64gb card. Instead I opted for 2x 32gb micro sd extreme which he gave me a discount of RM180 each, but then again went down to RM160. So yea, its still probably cheaper than online, but at least I know its a genuine product and from a really genuine seller. win-win.