I feel your pain. My mom and I went to Petco so that I could buy Prime, plants, the usual. And I bought her a 10g fish tank for HER betta. But she was getting impatient. So I grabbed the next stocked bottle behind Prime...wasn't prime at all. It was Reef Plus...for saltwater tanks.
It's very difficult to shop when someone is breathing down your throat. Luckily for me, I have my own car and make my own money, so I can go to LFS/LPS, and Petco/smart whenever I need to go. Plus online shopping for me is an option.
Is it a possibility to "online shop" for tank things, and then when you know what you specifically want you can buy them in the store? That way you have more time to look at live plants/fish?
1 Baby Betta & 1 Golden Apple Snail