Had an idea.... (which may be a really naff one).
Does anyone think there is any mileage in investigating house swaps between ourselves?
Just thinking would be lovely knowing you were going somewhere that had a secure garden, a trampoline for bouncing, Mr Tumble DVDs, stair gates, (add in whatever makes a holiday do able for you). Knowing you could ask for photos so you do a social story to prepare. Knowing you can ask for details on what's in the area, when is the soft play quiet, when is local disabled swimming session, which shops don't freak out at meltdowns, (add your own requirements....)
we have always gone in caravan/chalet at cheap times of year, but ds starts school in Sept, and school hols are so expensive.
I am just floating the idea......