Depending on what type of submarine you have some can be worth well over $1000.00, size, rarity, and most of all "condition" play a big part in the value. I am very familiar with (Terry's) Grandpamarble's store site. I've known him for well over 20 years. Here's the link to his store if ya want to take a look.
LINK : http://grandpamarble.com/index.html