I assumed this was no longer a thing because the thread is now 7 years old, but I would be glad to be proved wrong!
Update: with the code in hand, I rang up Tequipment to see if they would apply it retrospectively to my recent order... and the answer was yes!
*dancing banana* I would have given them a five star review anyway, but they really earned my custom and I will certainly be putting in future orders too.