Nice bike - 22" frame fits most riders.
I had the 17" in similar condition. Paid $50, sold for $90 after installing new tires. Local cash deals at both ends. It was a great rider, and the 17" camelback frame is great looking, but I needed to make room for a 20"
If the tires are good, and I needed a bike to ride, I'd pay up to $100 for that, knowing I could recoup some by selling off the speedo and gen/light set. The seat on there is also worlds more comfortable than the standard Speedster saddle.
If your locale is anything like where I live, another should come up before too long. Good luck!
Also, I wanted to mention that I've paid as little as $25 for a completely sound Speedster. Tires were previously replaced with 1985 date coded Kenda K23s, and although old, they were crack and rot free, and rather grippy. And hold air. That was my red 24" $25 1976 below, as purchased. I'll also include my $50 17" blue '68, I added the tires and grips. That's what they go for in CT. And if the condition isn't good, they sit forever at the $25 mark, I've seen it twice.