Where can I find a Slip on Exhaust for my 1985 Honda Interceptor without breaking the Bank?

On the highway my Yoshimura exhuast fell off my bike but i was already in 5th Gear so i didn't notice. Don't ask me how. But it was gone when i retraced my steps, i can Only imagine that someone picked it up, but now i need a new one and I Definitly need a replacement as fast as i can. Where would be a good place to start?

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