I'm probably the only one who cares about this but:
"Through September 8th, 2013, all battle sprites purchased from the Supply Depot will be sold at a 10% discount."
The sprites are 1900 CE
If 1900 CE = 90% then 190/9 = 1%
Therefore battle sprite are 19000/9 CE or about 2111.111111... repeating. you can't pay 1/9th a ce. >n<
If battle sprites are 2000 ce then they are discounted 5%. If they are 2100 then they are discounted 9.523809523...% repeating.
They could be rounding it, I'm pretty sure 10% is a lot easier to say than
"...will be sold at a 9.523% discount."