Update on my Aqua Cave order:
They sent me a second email 3 days after I placed the order, which is fine since I placed the order last Friday. Second email came on the Monday. In other words, I got the second email the next business day.
The email stated that the shipping charge would be $17 USD (for a $43.90 USD order) via USPS, and asked me if I agreed to this.
I then got a third email, same day, which is a copy of the invoice. No taxes showed on the invoice. Just product cost and shipping. The email body also had text, part of which indicated that "Tracking information will be emailed to you as soon as it is available.". I have received no tracking information thus far.
I logged into my account on their website today to access the tracking feature. There was no tracking info regarding my order. Something else I noticed while logged in is my order has gone from $43.90 to $48.85. I'll have to ask them about that

.
It's been only one week, but I do have concerns.
Cheers,