Completing Razer's set of entry-level Chroma peripherals is the new Razer Abyssus Essential, now available worldwide. The successor to the Razer Abyssus V2, the Abyssus Essential is an ambidextrous "no-frills" mouse with three Hyperesponse buttons—no more, no less (but if you're anything like me, the programmable macro keys on your keyboard are enough without stuffing a thousand buttons onto the side of your mouse, anyways). It comes with a 7200 DPI optical sensor, which is perfect for gamers who don't need to drop extra money on a higher DPI that may not be ideal for the types of games they enjoy playing.
The Abyssus Essential is powered by Razer Chroma, and the lights are customizable through Razer's Synapse 3 software; though the software is still in beta, I've had an amazing time using it on my own Blackwidow Chroma V2, and can attest to the fact that it's one of the easiest things in the world. This mouse in particular is the first Razer mouse with underglow lighting, so you'll get a nice light show reflecting off of whatever surface you're using it on.
Though it'll look great with any other Chroma-enabled product, the mouse pairs particularly well with Razer's Cynosa Chroma keyboard and Goliathus Chroma mouse mat as an entry-level set. You can learn more about it here, as well as order it for $49.99 USD.