The HRB lipo's are excellent batteries, not the cheapest. But also not silly prices either for what they supply, the C ratings are some of the best I have seen for the price.
I bought my first two HRB 3s 2200mAh's off Ebay about 2 and half years ago. They are still going strong no issues with puffing and excellent power.
I recently found them being sold on Aliexpress from various suppliers at reasonable prices too. However, I find that I get the best deals buying direct from the HRB official store
still through Aliexpress.
I got an even better deals with savings in the Black Friday sale.
Besides Lipo's I buy: Motors, ESC's, Receivers, Servo's and Props and assorted accessories from Aliexpress, delivery times are really good as are the prices. All the items I have received so far are the genuine item including: Emax, Sunnysky, Skywalker, FRsky and Radiomaster.
Just be careful as Tax and postage is added at the checkout, not the basket stage. So it can easily catch you out when you thought you had a real bargain.
I stick everything in the checkout and make sure I am happy with the final price including tax. If your not happy you can just click back and leave. This will take you back to the basket where you can remove specific items or cancel the whole lot if you change your mind.