I've had a Razer Blackwidow keyboard for over 6 years now and was considering replacing it as it was getting pretty worn down. Keys were fading and sticking, grime was everywhere and too much of a pain to clean, etc. Then I stumbled a set of Razer replacement keycaps on Amazon and decided to try them out
https://www.amazon.ca/gp/product/B07...?ie=UTF8&psc=1
De-capped my entire board, gave it a good brush down, then put in all the new caps and spacer bars. It feels like a brand new keyboard now, much more responsive and the keys themselves feel great. Definitely worth the $40 vs. spending $150+ on a new comparable keyboard, and the keycaps are compatible with most mechanical keyboards so even if you don't use Razer they might be worth looking into