Nice car, @DAVID BAYNE - BAYNIAC - Camp Hill - PA⁷. It's worth the ask (and a lot more) with the chassis and top
... but I totally understand the limits of the offer. If that's what you've got @Teach, just wait for one where the ask is a bit closer to your budget. Nobody will sell for $.50 on the dollar, and you'll likely just honk people off by asking. I did that once, and blew my chances at what would have been a great car at a price I could afford at the time. I will say that your willingness to sacrifice will either grow or you'll find something else to spend your $15K on (and you can find a lot of automotive love for $15K.... just not with a Speedster).
When I first got into this hobby 20 years ago, I thought I only had $13K to give. I was way, way (way) wrong. You'll have more money as time passes, or you'll find some other way to scratch the itch. The earth is littered with $15K Boxsters and Miatas, and they are fine cars.
If you do climb on the horse, you'll give $30K... one way or another. It's best to start out with the car that's a stretch, rather than trying to make a silk purse out of a sow's ear.
Buy once, cry once.