I bought some banana plugs at Sayal Electronics. They were Philips branded and I think the cost was about $2.00 a pair.This was a single screw model. They are located in Burlington, Missisauga and some other locations. They also had RCA connnectors for RG6 Quad Shield cable for the same price. Check their website.
Try Sayal Electronics. I bought some banana plugs there (after a kind tip from a fellow DHC'er). I know their location in Mississauga but they also have other locations - google the name for their website.
dealextreme has them for around $11 for 20 pairs when I ordered a few months ago. edit : I take that back, they HAD them but looks like all they stock now are male/female ones that I dont think would work for speaker connections