The LEGO® set 31009, Small Cottage, was launched in 2013 and retired at the end of 2014. It is a versatile set made of up 271 pieces and can be built as 3 different sets. It can be built as a small cottage, windmill or a skater’s house. It was designed for younger builders of about 7 to 12 years old and is quite fun to build. You can find the build instructions on the LEGO® site.
I paid $24.99 for this set around 2014. This was the US MSRP price. However, you can often get a sales price as LEGO® is about a retire a product and get rid of excess inventory. The current prices for a new set still in box, with all seals intact, ranges widely from $45 to $100. This is including shipping costs but does not include custom fees if shipped across borders. Regardless, you can find many sellers of this set and can find one in your country to avoid paying high shipping and custom fees.
If we go by the conservative $40, this still means a 60% increase. Assuming that you have had this set from time it was introduced, this is about a %18 increase year over year. For the same period the S&P 500 climbed %37. This means that so far, the Small Cottage set is a sound investment with a low initial investment.
Build Instructions and images on the box are © 2013 LEGO Group.