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):
|Saito T2dr Steam Engine For Model Ships||03/2019||C $ 849,57|
|New Saito T2dr Model Ship Steam Engine||04/2019||C $ 680,46|
|2 Cylinder Steam Engine For Model Ship||04/2019||C $ 616,06|
|Engine Boiler Oe 1 Ob 1 Set Display||03/2019||C $ 581,53|
|Saito B3 Boiler And Alcohol Burner And||06/2019||C $ 534,73|
|See all sold items for more prices|