I really like these KMC Perfect Fit sleeves. They're affordable
European Mini Clear for Board Games
Perfect fit sleeves - Double Sleeve your cards to protect them!
Dragon Shield Standard Sleeves - Matte Sleeves (100ct)
Dragon Shields AT-10001 Protective Sleeves (100-Pack
Dragon Shield Japanese Card Sleeves – Perfect Fit Sealable
Sleeves – Behold Games
Sealable Perfect Fit Sleeves - The best card protection!
Dragon Shield Perfect Fit Sealable - reinventing double-sleeving
Dragon Shield Standard Size Card Sleeves Sealable
Dragon Shield Perfect Fit Clear Inner Sleeves
Dragon Shield - Matte Sleeves (100), Standard Size
The Ultimate Double Sleeving Guide