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 (Canada).
|3 Foot Long Live Steam Engine Boiler||08/2019||C $595.96|
|Saito B3 Brass Boiler Steam Plant Rc||07/2019||C $268.17|
|New Engine T 1 For Model Ship Toy Marine||06/2019||C $198.52|
|Saito T 1 Steam Engine For Model Ship||09/2019||C $160.97|
|Saito T 1 Steam Engine For Model Ship||09/2019||C $150.83|
See all sold items for more prices.