I scored well. Gnarly parts (
www.gnarlyparts.ca) has the front sprocket for $11, the rear for around $27 and a new RK 520 chain for $32. I also ordered a new countershaft seal and shifter seal from Precise Bearing; all of those parts should be in by Friday.
Today I picked up two cheap dual sport tires, a generic rear fender and a 6 volt gel cell battery for cheap. I'm also going to order a replacement speedometer cable on eBay as soon as the seller confirms compatibility.
I soaked the seat latch and steering lock in lube and worked them until they would operate smoothly. I also got the spare key re-cut to properly works those locks (no charge at the locksmith).
Looking forward to more shop time.