The same kind of “shrinkage” is happening in seed packets. I paid $3 for a new bean variety, the packette had all of 18 seeds in it.
(Fortunately, it’s one of many bean varieties in my seed stash, and it’s an heirloom so I can build up my stock.)
I have seen some of the more 'exotic' tomato seeds running as much as $6.50 for ten seeds...$4 - 4.50 per pack isn't that unusual any more.