To the OP, sorry, this is a question that comes up often. If the trees can be easily dropped, you might be able to find someone with a mill in their backyard that might be willing to take the risk that there is no metal in them and drop them for the logs. You affirming that there is no metal in them is kind of like the guy walking into Pawnstars with no provenance trying to sell George Washington's spoon... Commercial mills don't take yard trees period. If they do hit metal, they are down for an hour or 2, and the lost production isn't worth it, ever.
If the trees require a technical removal, meaning not a simple fall, due to risk to property or structures, yes, you get what you pay for. A good professional arborist's business revolves around the health of trees, and in the event that removal is necessary, safe and clean removal. Honestly, the wood is a PITA byproduct of the job. You are paying them for their expertise and damn expensive equipment to avoid property damage. So my question is, if you find a guy willing to take them down for the logs, check his insurance very carefully, and be prepared to be left with a hell of a mess, because once he gets his logs, he's gone...