As others have noted, there are a LOT of C30's around, so you have fertile ground to peruse AND you can afford to shop around.
Not sure where you are, but we had to look elsewhere to find boats that were priced reasonably for their condition. We found some nice one on Texas lakes, but really didn't want to add $5,000 to the selling price to get it to the ocean.
Houston, Galveston, etc - all too highly priced for boat and equipment. People asking unrealistic prices for boats in sad condition. (Like the one with the green sails you mention)
We finally drove a little farther to a better hunting ground - lake Ponchartrain. We found several C30's there - even though we were originally looking for a Hunter 33 and other mid-30 foot boats. Frankly, the C30 MKII has more interior room than many larger boats
Ours was especially well-equipped with radar, Raymarine MFD, depth, speed, pedestal steering, autopilot, A/C - and it was clean and we'll kept. (It's a '92 BTW)
Kicker was that the area has a lot of bargains. This boat was originally listed for $29k, but recently lowered to $24k, and the seller's broker hinted that he'd take $21k.
We did a little sleuthing as well as perform our own "survey" checking all the likely suspects. (Thanks Don Casey!) And made an offer of $19k which was immediately accepted.
On that note, we should have started even lower, perhaps $17k. There are ALWAYS more repairs needed than you think!
Anyway, as others have pointed out, C30'S are hardly "rare" - so shopping around patiently will likely find you ones that are in better condition, later model with many early bugs fixed, and likely a "motivated" seller who is getting tired of paying slip fees and insurance.
Relax. Shop around. Be patient. You'll find better and better boats. Look to see how long they been on the market. Don't be afraid to make a low offer. Haggle.