Find bigest or lowest value in two column and write it to next

[mdbdesign]

It is hard for me and it is easy for you.
Need help to find lowest or highest value (dependent from boss requirement) from prices supply by parts suppliers and insert it into next available column.
As per test file:
Price cell D6
compare to:
Price cell F6

copy into cell J6 (let say) lowest price for item.

Continue to last available price comparison.
Hope it is clear.
Thank you for help.