Hi
Have come across one Yit-Ydra *at last* - in Act IV (so they do exist) just never been able to buy one when they would have been really useful in Act III.
Miss those transporter stones - still (the game is sort of flakey enough without trying to mess with the saved games

perhaps the designers will correct this design fault for the battlefields in v1.5 - must be due 1.46 soon.
Glad its not only me though.
PS: SORT OF SPOILER this may be well known but I always stash unneeded and yet to be used items in a barrell closest to Arrabella. Have found on some ocassions (not always) that this stash appears in a container on level one of battlefield one - regardless of act - so you can load this up/use items saving some 'long trecks'. As you can load the container it does take several trips (or resting) to dispose of the items with the merchants to ensure that they have enough gold though.