Where to buy sprockets?

[BL_RV0]

I'm building a weedwacker powered pocket bike at the moment, and need some help as to where I can buy sprockets for it. The engine's shaft is on the left side of the bike and the rear sprocket is on the right. Because it is like this, I am going to use a jackshaft setup. Overall, I need a 10:1 reduction ratio to attain 30mph. I've tried mcmaster, SDP-SI, and boston gear to no avail. If anyone has an idea where I can get these, that is much appreciated. I'd prefer polycarbonate or acetal to keep the costs down. I've also considered a beltdrive setup, but decided against it because it would cost upwards of $200 for the gears and belts!