The tariffs should only actually impact the US, Canada and (probably) Mexico - as products enter port via the US.
In other regions, there should be no direct impact on cost as a result of US imposed tariffs. However, companies may elect to offset some of the increase by increasing MSRP in other countries.
A lot depends on the date a product entered a port. So, for stock that's been sitting around en masse for a while, tariffs don't have to apply as the entered port pre-hikes (although some manufacturers or retailers are bumping prices regardless).
Any high turnover product, with constant shipments entering, will almost certainly see tariffs hit them and prices increase as a result.
A lot of manufacturer's actually ramped up supply ahead of tariffs, making sure there was volume sitting in a warehouse already through the port of entry. Newer product launches, or later product shipments don't have that luxury - and products that did have the luxury are probably seeing supply running low/dry.
Equally, on a retailer front, if they have say 10 of a given product, with a new batch anticipated soon - prices of the product are likely going up with the new batch.... So the price of the 'product' overall is up. Those 10 will be sold at the higher price, as they're not going to differentiate on their site/in their store of what came in before/after tariffs.