Aiyo, take it as a holiday/ short vacation lar.
I went there last year.... hell lucky i didnt bring my extra card/ cash....

bought my Crumpler from there.

No, if your iBook still in Applecare Warranty, just get Apple replaced it for you if it's damage or not working. Officially there wont be any discount for buying accessories even you have extended the warranty. You can try talking with the shop you purchased the iBook from, but very unlikely.