I use the Ultra Pro Deck Protectors for all my player cards and haven't really noticed any slope to a stack after using them for a few games. I've only had 1 split in 2 years, and I love the fit and feel of these sleeves. cheapmagicsleeves.com has been the best price I've found to buy them in bulk. I hadn't taken the plunge to try sleeving all encounter cards until yesterday. Mayday Games is having a moving sale, and packs of 80 are $1.40 (plus 10% off if you join their email club). I don't know if they have completely clear sleeves, though, and I haven't tried them out for quality. I went ahead and got them since the only other method cheap enough for me to consider would be penny sleeves.