The most popular cages on here are from Zooplus. The Alexander and Barney cages. I have the Barney which is 100cm by 54cm and a good size for a Syrian but that's about the biggest they sell in actual barred cages.
https://www.zooplus.co.uk/shop/small.../hamster_cages
In the US there aren't any 100cm cages I think - I only know of 80 x 50 ones. So most people use 40 gallon breeder tanks (3 foot) or 75 gallon tanks (4 foot). OR make diy cages.