Home depot helpfully puts aisle and bin numbers for products on their website if you search for things in-store. I also can get help at home depot pretty quickly, as long as you're not there on the weekend (when they're just completely slammed, victim of the own success is what I call it).
Your Home Depot is staffed radically different than mine.
It doesn't matter when I go there - mid-day, mid-week; or prime time, weekend. There's virtually no employees.
I usually end up going to the Customer Service desk and waiting 10 minutes while they summon someone on the radio/phone thingy.
Once the only person in the entire store was the lady at the self check-out aisles. And she couldn't help me because she wasn't allowed to leave her station because she was the only person in the store.