The Nokian Kontio and Hai rubber boots are the best rubber boots there are. I have the products here in my rainwear store to make it easier and for other Europeans to acquire them. These ready for dispatch couple of days after purchase.
 
Tightening strap, reflective band
Reinforced rubber on the leg and the upper
Quick-drying polyester lining
Side reinforcement
Shock-absorbing heel structure
Hard-wearing, dirt resistant outsole
Comfortable fit
 
More info: https://www.nokianfootwear.com/product/kontio-classic/
 
I can also get colourful Hai rubber boots along with everything else from the Haicolours website. https://www.haicolours.com/collections/kaikki They don't unfortunately ship abroad, but I can get them to you for a little fee. I take about a 15 euro cut to make up with the process =)
 
You can freely write me if you need any further info.