Sometime during all the launch hype of last week's new MacBook Air and iPad Pro, Apple quietly increased the prices of almost all Mac build-to-order options on its regional online stores outside the United States.

In Canada, Europe, Australia, and many parts of Asia, customers configuring any new ‌MacBook Air‌, MacBook Pro Mac Pro or Mac mini now face paying approximately 10 percent more for each component upgrade than they did prior to last Wednesday.

In the U.K. for example, when customizing a base configuration 2.3GHz 8-Core 16-inch MacBook Pro, upgrading to a 2.4GHz processor costs £200, where previously it cost £180.

Likewise, jumping from 16GB to 32GB of RAM now costs £400 (previously £360), bumping the AMD Radeon Pro 5500M GPU from 4GB to 8GB costs £100 (previously £90), and upgrading from 1TB storage to 2TB costs £400 (formerly £360).

Altogether, the hikes add an extra £110 to the price tag of this built-to-order 16-inch ‌MacBook Pro‌ – a combined total of £3,899 rather than £3,789.

16-inch ‌MacBook Pro‌ BTO prices – March 16 compared to March 23

Apple didn't change the standard prices of its Mac base configurations, which is probably why the changes initially went under the radar. However, two eagle-eyed readers from the U.K. got in touch with MacRumors after the total cost of their custom Mac configs, which had been languishing in their online Apple Store bags for a time, suddenly changed overnight.

It's not clear what provoked Apple to raise BTO Mac prices for consumers outside the U.S., although fluctuations in exchange rates, supply constraints, and labor shortages can't be ruled out. Either way, the fact remains that processor, RAM, graphics, and storage upgrades selected during checkout cost around 10 percent more than they did this time last week.

(Thanks, Andy and Glen!)