If you're looking for (new) parts, they have them but their website is mainly in Japanese. Here is their parts page in Japanese and here their site in English. On their 'Distribution' page you'll find contacts.
What's your 'Saito Steam' worth? Here are some recently sold items (UK).
|Superb Boxed Saito T2r Model Twin||09/2019||£495.00|
|Superb Boxed Saito B2e Model Marine||09/2019||£395.00|
|Video Saito Twin Marine Boat Launch||09/2019||£350.00|
|Engine Y2dr Twin Cylinder Boiler||09/2019||£252.00|
|Saito T 1 Steam Engine For Model Ship||09/2019||£89.97|
See all sold items for more prices.