I've just released a new product for Blender; True Space.
True Space Is a pack of 18 HDRi's that comes in 2 qualities 4/5k and 8/11k images. The HDRi worlds have already been set up and ready to use, you just append the world node from one of the .blends into your scene for quick and and easy use.
Go to the Blender Market and see what they're all about. If you decide to buy, use “Existing25” at checkout for a further 25% off.