Was looking for relay cards on Ebay for automation
Well this one starts at 99 cents. It does all kinds of things , but you only need one for relay runner the relay part. I have seen just relay cards go for around 10 bucks.
Note there is many system out there , but simple work best. IMM in my mind (small) Container large but it holds up my ears.
Changing sequences is just clicks away, at least on earth.