I should have realized -- the warm spring is placing a heavy demand on this sort of product.

Here are two other PAC based products, as determined by the 2 - 4 year old MSDS sheets I have -- but be very careful to look for the complete brand and product name:

"ProTeam SUPERFLOC CLARIFIER" (not available on Amazon)

Blue Wave Super Floc 4 x 1 qt. @ Amazon - 4 days from order to ship date

If you want to look locally, and then ask, post EXACT brand and product names. You do NOT want to put aluminum sulfate in your pool. It's very twitchy, and if you don't get things right, you can make a mess. Also, be aware that Amazon is pretty up-front about shipping delays, but most online companies are not. One of Amazon's strengths is that, being in so many different markets, a single product line's busy season doesn't slow them down. But, with pool shipper's that's not true. Anybody in the pool business who is able to get caught up between now and July 4th, is probably on their way out of business!