If it is anything like the UK, then it is anybody’s guess. We usually get different ranges suggested on the SmartThings UK and Samsung UK sites, and they never seem to reflect what is actually available anywhere, not even in Curry’s which at one time was supposedly the exclusive retailer in the UK.
At the moment the SmartThings UK site lists the Arrival Sensor in the range but the ‘Buy’ button goes to the US site, where it is offered for $19.99. If only it were really that cheap here. The UK retail price was about £29.99 at the very best. Curry’s have listed it at £12 for months, without having stock, which smacks of clearance pricing.