I buy in packs of 20 - MAXIMUM. If have more i purchase after i brought the 20 pack, as my char can only hold 80 items which is 20amus and 60 from the pack.
Leave how many u got.
Also:
Offer 1 fgs each
Sol/pr/Jewel pack
Offer 0.8 fgs each
amn/pr/jewel pack
and
Offer 0.75fgs each
Thul/PE/jool
Leave how many u got and which pack.