Hi. I saw this one. It's bigger than the ones you take them to the vet in, but not too big to fit on a car seat between two people I reckon. Big enough to have a little house and a toy, some food, a chew, and its deep for substrate - not sure what you would do about a water bottle though - it might be possible to rig one up through the vent holes. It's £11.95 and measures 40cm x 22cm and 30cm high - about half the size of a proper sized hamster cage. It might be better than those smaller carriers if it is for a long journey, but a hamster couldn't live in it and would need to go back in a cage the next day (sorry if I'm stating the obvious!).
The other one I was looking at was the rabbit sized Ferplast Aladino, which is smaller (36 x 26 x 23) but costs £17. If it was me, I'd go for the bigger one - the first one - if you think it will fit. It's a bit wide at the top, but narrower further down.
Really sorry for your upheavals - I hope you move on to something much better.
http://www.amazon.co.uk/Trixie-Mini-...rabbit+carrier
Ferplast Aladino Rabbit Carrier, Large, 36 x 26 x 23 cm, Blue: Amazon.co.uk: Pet Supplies