The chandlery stuff is pretty poor. Being thin and nylon it lasts a couple of years at most. Childrens play centres use robust colourful netting. No idea what width. These people seem to supply. I think someone posted a link to a supplier a while ago.
You could try Kayospruce at Titchfield,Fareham 01489 581696 or Google. I think they describe it as" Mesh/Netting in Blue General purpose skip Netting(ME366BL); and Green Skip netting (ME366GR) Widths in 366cms.(Does not quote a mesh size though).
Force 4 Chandlery also stock Guardrail Netting 66cms width when opened and mesh 5sq.cm
This is sold as 1metre opened price and they supply 1.5mtr unopened(£3.95 per metre(open)). Tel 08451300710 or email sales@force4.co.uk
In both instances it pays to ask for their current catalogue, if charged still worth buying it.