thickest outer record sleeves, where to buy them?


hi,
3 or 4 years ago I bought a very thick outer plastic sleeves for my records. They can stand upright without a record inside and they are 100% crystal clear transparent. Im trying to find those same sleeves in the market but I can't... can you help me please? thanks in advance
jorsan
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.
thanks for the responses. About the reason why I like them more honestly dont know: maybe I consider thiker sleeves protect better?, maybe Im use to use them? ... dont know but I like them more.