I've done very well on Freecycle. It is indeed free cycle, I started with 2 BSOs that I made into 1, a mate now rides that. Another needed tyres and cables out of the bits box, I rode it around for a while and gave it to another mate for shopping duties, it does well. Best was a Dawes Galaxy that needed very little and I gave it to my Dad, he uses it very rarely and I've ridden it more than he.
A mate has done very well indeed at the local tip. I think he employed the simple tactic of turning up with a bag of pork pies once or twice and getting the blokes to put bikes to one side "I'll be back next week". His 2 sons have had free bikes for years on this basis, too many people throw away decent bikes when the tyres get split or a chain breaks. As his boys have grown out of bikes he's passed them on to neighbours and taken the old ones for spares.
On that basis I'm convinced that if you want simple wheels for going to the shops or pottering about with the kids and you know one end of a spanner from the other, you can cycle for free.