How Common are Minnesota Extra Tree Quarters ?

This morning I found a link to the Minnesota Extra Tree Errors. I dug out my one opened 2005 Mint Set and found the type 4 error on a Denver Quarter. So how big a deal is this? I had heard of the extra tree errors but never really paid much attention before now.
I have ten more unopened sets - are they worth opening? How about my one opened set - worth getting the Quarter slabbed? Sell as is? Or is it a really common thing?
I have ten more unopened sets - are they worth opening? How about my one opened set - worth getting the Quarter slabbed? Sell as is? Or is it a really common thing?

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As common as trees in MN!!
<< <i>Where is the X-tra tree located? >>
To the right of the 4th tree - right of the state outline. You can see a pic in the link. I made a boo boo in saying I had a D-mint error, my error is on a P-mint quarter, it's a DDR-#4.
lots of pictures - long load time
<< <i> How common are extra trees??................
As common as trees in MN!!
>>
Or did you find this one:
If you found the second one on a D Mint coin then you have something significant. If you found the first one, then it obviously has already been identified and will probably bring maybe 10 or 20 bucks unless you get real lucky.
The prices on these have come down significantly in the past month, even for PCGS graded coins. Of the 67 varieties, only about 7 or 8 actually bring any kind of serious money. I believe those would be P Mint 1, 2, 4, 6, 7, and 12. For the D mint, #1. Basically, if you can spot it with the naked eye, it will bring some money but other than that, you just need to attract the right bidders.
The name is LEE!
Some of those DDR's are a joke. Looks as if you'd need a microscope to spot them. As it is, you need a loupe to see the one I got. It's a bit rough to see it unmagnified.
The varieties can be spotted with a loupe but with my mature eyesite, I really need a microscope to actually verify which variety it is. Age, is not man's BEST friend.
The name is LEE!
<< <i> Age, is not man's BEST friend. >>
Yeah, I'll second that.
It's like they say - "Youth is Wasted on the Young".
Man, you just don't know what you got until you ain't got it no more.
That being said, imagine what it's like to be 80. You're sittin there in a rocker thinkin " Damn, if only I knew what I had when I was a young man of 51 "!
Guess you just gotta make do with what you got when you got it.