Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Cheaper by the 1-Pack?!

I'm a died-in-the-wool Pur user. I have a Brita pitcher as well, which I was forced to buy when Pur had some kind of epic distribution failure and couldn't stock replacement filters here or any retailer that I could find.The Brita pitcher is flimsy and cheaply made. Pur water - from Los Angeles DWP tapwater, at least - simply tastes better than Brita.But here's a wacky thing: As of this writing, filters in 4-packs cost $1.50 each MORE than filters in 3- and 2-packs. Filters in one-packs are the best deal of all! They cost $0.60 less than 2- or -3 packs, and OVER $2.00 LESS per filter, than buying the 4-pack!Crazy, isn't it? Sure wish I'd noticed that *before* I ordered that 4-pack, for an extra $8!!!Do you see that, too? Or is this an example of Amazon's mythical Customer-specific pricing?Anyway, caveat emptor, fellow Pur users!