Sleeve City does indeed sell the 5 mil ones:
http://www.sleevecityusa.com/ultimate-outer-5-0-record-sleeve-p/9380.htm
I agree with you about the thickness being too hard to use. I tried them many years ago and went back to the 3 mil sleeves.
http://www.sleevecityusa.com/ultimate-outer-5-0-record-sleeve-p/9380.htm
I agree with you about the thickness being too hard to use. I tried them many years ago and went back to the 3 mil sleeves.