Update: Amazon also has the Paris set on sale for $40.

Building LEGOs is a great way to relax during stressful times, and LEGO's city skyline sets aren't just fun; they're also educational and beautiful.

It's no surprise that the sets are sold out at a lot of retailers online, but Target currently has both the London, Paris, and Shanghai skyline sets on sale for 15-20% off, with free shipping. The 649 piece Paris set is highlighted by the Eiffel Tower, but also includes the Louvre, the Arc de Triomphe, and more. The slightly smaller London set features miniaturized models of Big Ben, Tower Bridge, the London Eye, and more.

As always, REDCard holders can get an extra 5% off at checkout.

LEGO Paris Skyline Set | $40 | Normally $50

LEGO London Skyline Set | $34 | Normally $40

LEGO Shanghai Skyline Set | $48 | Normally $60