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).
|Complete Saito T3dr Steam Engine And B3||09/2019||C $1 490.03|
|Unused New In Box Live Steam R C Saito||11/2019||C $1 058.24|
|Saito T2dr Steam Engine For Model Ships||10/2019||C $841.69|
|3 Foot Long Live Steam Engine Boiler||08/2019||C $596.00|
|Saito V4pr Brass Model Ship Live Steam||11/2019||C $662.21|
See all sold items for more prices.