HG 00 Diver's price at 1000 yen only applied for the first production.
After the first production, Bandai will include the power up extra weapon set into HG 00 Diver.
Which the pricing will be increase to 2000 yen item.
P.S. HG 00 Diver has more than 1000 yen quality, so make sure you don't miss out this opportunity to get the HG 00 Diver with low price.