Here's a non-QR skewer Delta Axle Rodz non QR skewer set

Here's an even cheaper set with one for the seat post Evo 3Pc Skewer Set - Fr, Rr, Seat

OnGuard makes a set that release only if the bike is tipped more than 90 degrees. They're expensive OnGuard 6100 Steel QR Wheels & Seatpost Locking Skewer Set

I'm not recommending these vendors, just using their websites to find stuff