A bit harder to sell than 11% - 13% Rarities, but I think you can still sell it for less than 1 le. Perhaps about 1.5 LE. People mainly buy it for either good poison or good attack speed so watch out for those. I would say 1 stack and 48 LE, but do ask others. Memento 1 probably can go for up to 5 LE. Memento 2 maybe up to 3.5 LE. Standard market price would be 20 EB, but with the upcoming update and it becoming a 2 Star ingredient, it is too early to tell how 1.18 will increase the price, my prediction is 32 EB and then gradually decrease in price again.