I have a signicade A frame street sign that takes standard inserts.I buy a pair every two years ( the exact same deisgn):
In Sept 2019 two inserts cost $61
In August of 2021 I bought another pair for $89 ( 50% price increase in 23months)
I just checked today (Sept 1 2023) because i need another pair and the price - $214!
That's a 350% increase in price in FOUR YEARS! I talked to a representative and they said materials costs have gone up. Cardboard and vinyl plastic costs went up that much. Ill never go there again.