FWIW I was at a Lowes in my neck of the woods and they had (1) 6PL and (1) G2L at full price - around $85 and $65 respectively. I was looking for an incan G2 at Sportsman's Warehouse b/c I passed on a great price when they were going through bankruptcy as I didn't know any better at the time. It was last year sometime and they had lots of 'em in all the different colors.
The 6PL is a nice light. It's not the brightest you can buy but it has a very uniform beam. I also got a G2L without knowing that the head was aluminum. I know why now (heat dissipation), but it kinda defeats the purpose of a polymer flashlight.
Until recently I mostly only had store bought SureFires and Inovas. While I couldn't be happier with my new Quark 123 and Olight, I now realize that my more common lights are quality lights. Opinions may differ as to what you get for the price, but I'm glad I have them. Although I now want a dropin for my 6PL and could have saved 20 bucks if I had bought a 6P instead, I didn't know that when I bought it. Plus, I've gotten good use out of it and have quickly learned it's not all about maximum output. While I haven't posted a lot nor been here long, I have read enough to discern whose opinions I value most. While a forum isn't the easiest way to quickly learn about a subject, we're talking about flashlights and it's supposed to be fun.
I even gave my Mom a 6PL thinking she wouldn't be able to appreciate it more than some of the Coast flashlights I've given her in the past. Well, who knows where those other flashlights are, but that 6PL stays in her bedside drawer and gets used often. I do need to replace the tailcap with a "clicky" one, but I know she really likes having this flashlight and it gives me a little peace of mind knowing that she uses it.
But to answer your question, I think $70 is a very good price. From what I've seen, it doesn't appear that Lowes is restocking the SureFires, so the few that might remain may get marked down. Finding a brand new 6PL for $42 would just be good luck.