We've recently released water line models of the LVTP-7.

There are three variants to choose from:
LVTP-7 - The original Landing Vehicle
AAV-P7/A1 - The improved Assault Amphibious Vehicle
AAV-C7/A1 - Command version without a turret

Water line models cost:

6mm is £1.15
12mm is £1.80
15mm is £2.75
20mm is £5.50
28mm is £12.50

The models are available in most scales.

LINK