Generally when I buy and sell heads I will either ask that the head be crack checked by the seller and if its good I'll reimburse him the cost, If its bad he pays because he'd have that burden anyway if I checked it and it was bad. He would have to refund my cost and shipping usually but set that up prior to a sale so you both know whats expected.
When I sell I crack check and add it to the cost because the buyer would have to pay that anyway. If its bad I eat the cost.
There are plenty of 235 heads around still and plenty of good sellers that will accommodate you on a crack check.
The one listed above is a good deal for a crack checked head loaded.