Buy $50, get $10 off LEGO sale. Amazon has the LEGO 10311 Orchid+ LEGO 10309 Succulents on sale for $42 each. Add both to cart for $84 - $10 off Multi-buy discount in cart = $74 with free shipping. ($37 is a price low for each set.) 

A few other interesting combos in the promo:

• LEGO Architecture Paris Skyline +LEGO Architecture London Skyline for $80.
• Harry Potter Defence Class + Harry Potter Potions Class for $50.
• Marvel Spider-Man at The Sanctum + Marvel Black Panther Dragon Flyer for $49.