The best deals for laminate flooring

[SaudisLoveAudis]

Hi All
Would you suggest any other suppliers?
I think I am after 7 and 8mm thick laminate boards.
The ones I was thinking about:
https://www.factory-direct-flooring.co.uk/prestige-8mm-castle-oak-ac4-laminate
https://www.factory-direct-flooring...oak-7mm-v-groove-click-laminate-flooring-3903
https://www.factory-direct-flooring.co.uk/prestige-7mm-spirit-oak-nature-laminate-flooring-3125
The thickest they have is 12mm and it's rated for 25 years, heavy domestic use

https://www.woodfloorwarehouse.co.uk/oxford-oak-grey-brown
https://www.woodfloorwarehouse.co.uk/natural-charlotte-oak
https://www.woodfloorwarehouse.co.uk/achensee-oak
but it turned out more expensive.

Floor King has this one I like but again this has to be ordered from the same supplier otherwise I lose on deliveries:
https://www.flooringking.co.uk/shop...lam/cfs-supernatural-classic-8mm-harlech-oak/

8mm - heavy use - 20 years domestic use (living room, higher traffic areas)
7mm - medium use - 15 years domestic use (bed rooms)

The Costco ones are almost twice as thick.
https://www.costco.co.uk/search?text=Laminate Flooring

I checked the doors and on the ground floor and in the dining doom there is at least 18mm clearance and between 25 and 30mm in the living room.
Upstairs it is at least 22mm clearance but I put the wood fibre underlay boards only.

I could consider a much thicker boards downstairs. Wherever I read they say to put 5mm underlay boards but do I have to do it if laying thick 12mm+ boards and on concrete?
Wood Floor Warehouse - is more expensive on smaller orders and the delivery is a bit pricey. They don't go under £60 on delivery