Would a September YACF camping trip for a quid a night be an idea? Maybe here http://www.foxandhoundshotel.com/ on 21/22September?
I confess to having a little local knowledge about this one - It's a bit of an odd place. I've stayed there several times and they've varied between welcoming and hostile. If there are a lot of locals in, visitors will have to wait longer for their food orders than the locals, will get booted out of the restaurant into the function room, wait for the locals to get served at the bar first, etc. However, the food is good quality, and not too expensive (apart from cooked breakfasts which are eye-wateringly pricy). The beers are well kept.
The showers are in the bunk house and not all that clean, the shower curtains are one mutation away from becoming sentient.
It is in a lovely location, though. There are some lovely walks up to Brat Tor beginning at the back gate to the property, and you're right in the middle northwest Dartmoor so Brentor, Bridestowe, Okehampton, Tavistock and Lydford Gorge are all possible ride outs. It is hilly though, bring granny gearing.