Downey has a front aftermarket skid plate. It is super strong and thick and probably the same price or cheaper than an OEM one. It is about $200 (US). Not sure but it might need a little tweaking ot fit. Also, no hole to access the oil drain.
Bud Built has full aftermarket skid plates for our 4Runner. They are top quality, fit well, have a oil drain hole, great service from Bud but the cost is outrageous.
If all you are looking for is the engine skid, Downey looks like a good deal.