i've never paid for any plumbing supplies - nor have my parents from when we moved when i was 6 - one of our neighbours is the supply manager at a plumbing place. he won't accept anything at all, so once a year (we space them through the year) he gets a slab from each of us. when my hot water service died, i paid cost price for the actual service, but the labour was free (from his employees - his boss doesn't care). Got the whole house changed from Gal to copper pipe, with water filters etc when i first moved in - didn't pay for any of it. he wouldn't let me!

have helped many people move for a slab.

i did all the invites/place cards etc for an (ex) friends wedding for a slab of cruisers (she didn't pay - it was not the reason we are no longer friends lol)

We tend to have a Bundy currency around here as most of hubby's friends are bundy drinkers...

although... DH is helping a friend with some landscaping - and we have massage currency for that one! two hours of DH working means a one hour massage for one of us - sweeeeeeeeeet!