Anyone know where I can get cheap out door handles from that are either new or in really good condition?
Mine have started to crack on the bumper part!

There's no point getting secondhand. They are also handed and can not be switched about…. The metal pin inside them also expands over time and makes them stand up. I think they are around £35/ £40 from fiat….Ive replaced 3 on mine now.

That's a bit pricey
Seen some on eBay.it and they are pattern parts at 10euro each

i replaced my driver side outer door handle
i got from a breaker.
my son broke the original one
cost me £20 including post.
mine is a 2007 multi.
but they never changed them so u might get
a cheap one from an early model like i did.
but don't loose the rubber that the
door pin fits in.

How difficult is it to do?

sos ive not been on here
for a while.
its not a hard job just a fiddle
once u got the door panels off
u will need a long pair of plyers
but if you got it done by now
well done

This is from a while back, I know but I have to change the door handles now. There's a great vid on Youtube by Richman Poor Motors, just search Fiat Multipla Handle Replacement.

Need to add something here now that I've done the rears.
Remove trim as in the video I cited above and then remove the handle, I used blu tak on the end of the allen key after dropping one bolt inside the door.
Now the interesting bit is that with older models (I imagine that's the case) there's no connecting rod between the handle and the mechanism, where they meet. The new handle just slots in while holding the inner door handle in the open position. Slot it in, screw it up and Bob's your uncle.