A 100% increase in the price of their chains when the silver
market increased 20%.
I am not an apologist for any of these folks, but a possible
explanation is the "straw that broke the camel's back". Sometimes
suppliers hold the price, hoping the inflation will pass, then
finally have to raise it dramatically.
I just bought hammers from Rio that I need for students. The price
for one item is the same as last year. However, last year they
offered me a $10-per-hammer discount at the quantity I needed, and
this year could only offer $6 off because of metals price increases.
It seems silly, maybe, not to have raised the base price, but it
often happens that way.
If, on the other hand, your items have been keeping pace with
increases, then shot up-- that's gouging!