I'm travelling to Saskatchewan to visit family with my 4 year old daughter. She is 42" tall, 38.5 lbs. Currently we use a couple of True Fit's in our cars at home, I don't want to travel with those as they're pretty heavy and bulky. Ideally I'd like to order an inexpensive seat to be sent to my sister's house over there, let her install it in their car for our trip, and then probably just leave it there (she has a 6mth old, maybe they'd be able to use it for him so it wouldn't go to waste?). Any ideas? She's too light for a hbb - and I'd much rather keep her harnessed since she's still harnessed at home and will be for quite some time. Anything good but not going to cost me as much as our flight?