For those in the UK...
I bought these today from B&Q...
B&Q Select Apex Under Cabinet White LED Lighting Kit, Pack of 4
https://www.diy.com/nav/rooms/kitchens/kitchen-storage/kitchen_lighting/B-and-Q-Select-Apex-Under-Cabinet-White-LED-Lighting-Kit-Pack-of-4-10547669?skuId=11038360
A bit...