Hello;
1) To be honest, it varies depending on the manufacturer and their inventory. We see no reason why you would not get your order in a reasonable amount of time, but again, it's up to Sigma USA. FYI, we have a Used item [Used Cat.# 1096615], Condition "9" for $349.95.
2) If you place your order while the lens is priced at $399.00 [Instant Savings: $80.00] that is what you will be charged even if the price goes up when your order ships.
3) B&H has a long history (Since 1973) of providing impeccable Customer Service and Business Integrity. This forum trend is a testament to our dedication to the Pentax user community and their concerns.
C h u c k C a p r i o l a
Live Chat and E-Mail Sales Manager
B&H Photo-Video
www.bhphotovideo.com