I know, it's insane! It's almost not worth it to get dry yeast for the convenience anymore.
Farmhouse Brewing Supply has S-189 in stock now as well. That was a pleasant surprise when I was browsing the other day. I will be giving this yeast a go here soon.
Seems that most places are stocking these now. S-189 is the most expensive yeast I have seen with some retailers selling it for over $6 per sachet.
Well, convenience and price are two different things. Remember that with a dry yeast you are getting a pitchable quantity. Also, you are getting longer shelf life. Then, you are getting the convenience of using it at a moment's notice, no starter. If you are buying online, dry yeast tolerates shipping better.
As far as price goes, if both dry and liquid are the same price, I would suggest that you're getting more for your buck with the dry yeast.