hi,
if anybodys interested ive found a site that sell 1/35 cobra gun ships, might be ideal for a diorama for vietnam or mogadishu.
heres the link


http://www.pier-models.co.uk/acatalog/Pier_Models_Helicopters_52.html

they also have a lot of other cheap kits. I havent ordered anything so cant vouch for them but will give it a go.
martin