@WeldmanI have also noticed looking at the Hoe Depots website lumber is limited in quantities of what you can buy. Thinking about loading up on cinder blocks months before I start building on the house cause they might be next.
Smart move. Do some research on Construction Aggregate Pricing and you should get a trend of what might happen.
Road Construction contracts are ramping up (or so I hear, I don't track that sector so I only know what I hear) and when roadwork increases the price of aggregate/rock/stone/cement/etc can go through the roof. If I were a betting man, Aggregates might go into short supply sometime this year, if only for a short while.