There are different Foreign Extra stouts brewed under license all over the world. The most famous ones are Nigeria, Dublin and Far East (prob Singapore). They are delicious and I particularly like the Nigerian version. You have probably already discovered this vendor, but just in case you haven't:
http://www.onlyfinebeer.co.uk/beer/530/
They can sort you for both large and small Nigerian bottles and Dublin bottles. Postage will be a killer and you may have to phone them to arrange. Plus you'll have to pay import duty, etc.
and this vendor does slightly cheaper Dublin FES:
http://www.thedrinkshop.com/products...hp?prodid=4391