Tetra Aquasafe w/ Bioextract 8oz $4
At Amazon.com $3.96 to be exact. I think it's an error because that's way cheaper than the usual price, even for Amazon. The 4oz bottle is almost 6 bucks. I have a Prime account so I get free 2-day shipping. It's also eligible for free shipping with a $25 purchase if you don't have a prime account. Or just sign up for the free 30 day Prime trial to get the free shipping.
So anyway, I got 3 bottles. Just thought I'd pass the deal on. I don't know how long it will last.