I've had a few people inquire about the blue bus that is featured in some of my pictures of NotLego town. I modified mine, but you can get the original City Bus from Aliexpress. The set number is M38-B0330 made by Sluban. If it makes you feel better, this Sluban bus is not a bootleg or clone of a Lego design. It's Sluban's own design as far as I know.
The bus features three non Lego type minifigures and has two opening doors and lots of seating for passengers. I also really like that the windows have a dark tint, not clear as in the Sluban pictures. There are 238 pieces in this building set. It can be found on Aliexpress for $9 USD, which is about what I paid for mine. For this low price, you could buy two sets like I did and build your own stretch bus.
Here's the link to the set:
https://www.aliexpress.com/item/Sluban-City-Bus-Assembled-Monolayer-Building-Blocks-DIY-toys-Educational-toys-for-Children-Compatible-with-Lego/32626021618.html
Please remember that I cannot verify whether the seller is good or not. Use your own judgement and research before making any purchases. I have no affiliation to Aliexpress or the sellers found there.
