I bought them new from Amazon before found out that my roommate also have dish rack in the apartment.
Note this is SIZE LARGE!

Get it NEW from me for much cheaper (& skip tax!)
(Price on amazon is currently ~$40 with tax!)

Rubbermaid AntiMicrobial In-Sink Dish Drainer:
https://www.amazon.com/Rubbermaid-6032ARWHT-Large-White-Dish/dp/B0044URHD0/ref=sr_1_8?s=home-garden&ie=UTF8&qid=1538072814&sr=1-8&keywords=Rubbermaid+AntiMicrobial+In-Sink+Dish+Drainer

Drain board (Size Large):
https://www.amazon.com/Rubbermaid-Universal-Drain-Board-1855235/dp/B00NKZDV76/ref=sr_1_12?s=home-garden&ie=UTF8&qid=1538072814&sr=1-12&keywords=Rubbermaid+AntiMicrobial+In-Sink+Dish+Drainer