Tsunami
nbc.com

Lord Darkclaw
Do you mean the full 1/1 scale adult form alien? NOT cheap! A 1/1 scale model would be mainly made of fibre glass which is a lightweight material so it wouldn't be hugely expensive to import one from the USA (maybe £100 shipping) but you are talking about thousands of dollars even if you buy one being resold by a private collector. Smaller resin models are a more realistic option, sign up on The Clubhouse and ask around; you might find someone has a fully painted model up for sale. You'll have to register your email before you can use the website. The cheapest option is to buy a resin kit but they are a b!tch to prepare and assemble so buying a fully painted one from a reputable seller may be your best option unless you are in to model making. This is a collection of Aliens and Predator models owned by a guy called "Sabre"