Hiya,
Try Franklin themselves. They have this on offer at the mo
"NEW ! PZL-Franklin 4A-235-B31 (125 hp). Factory New 4-cylinder engine in Factory sealed crate. FAA-certified. 235 cubic inch displacement. Fits O-200 mount pattern. Save BIG $$$ getting your project flying now! Only $6,900.00"
Maybe if they've gone bust though the website isn't updated anymore?
Fargoo