Steel scuba tanks used in North America come from Italy. The most popular sizes are constantly out of stock. Materials/manufacturing issues and shipping delays. The price on used steel tanks has gone though the roof.
I got lucky that my instructor in WI loaned me a pair of tanks for the winter so I don’t have to use the expensive Trimix (has helium) in two pairs of tanks from deep class days that didn’t happen this summer due to scheduling issues.