my first question is how much does the next day shipping cost?? and how often do they mess up orders? i only odered once (2 AC 500's) and they accidently sent me 2 reverse flow kits and one of the housings for the filter was cracked... well we called them and told them and they sent a new filter housing and told us to keep the reverse flow kits... have any of you guys got anything extra before?? and one more question, do you think they would give me a discount of any kind since my b-day is tomorrow? i didnt think so 