So far I know of 2 companies that are making skid plates for the Xpedition. Super ATV has both the 2 seat and 5 seat versions out now. I believe free shipping is available also. Don't think there is a military discount though. The 2-seat version is currently offered at $607:
https://www.superatv.com/polaris-xpedition-full-skid-plate
And the 4 seat version is currently offered at $764.96, down from $849.95:
https://www.superatv.com/polaris-xpedition-5-full-skid-plate
The other company is Trail Armor: The black skid plate for the ADV5 is offered at $1100 plus shipping but there is a military discount of 10%:
Trail Armor Polaris Xpedition XP 5 and ADV 5 Full Skids
They do offer different colors at an increased price. I do not believe they have the 2 seat version available yet.
Now for the likes/differences (comparisons) I see right now. Besides the prices and shipping cost differences, Trail Armor offers different colors and also offers side plate protectors where Super ATV does not. Trail Armor does offer a "Trimmed" version that is similar to Super ATV's without side protectors. Personally, I've had TA skid protectors on all my vehicles and in the west the side protectors are a must. Rock sliders get all bent up and ripped off by the rocks IMHO. Also, Trail Armor has a removable protector cover for the rear area to change the oil filter from below the vehicle whereas Super ATV leaves that area open. If you want to protect the bottom sides of your Xpedition with the Super ATV skid plate you'd have to add rock sliders that would bring pricing a bit closer together for the 2 companies.
As far as construction and materials used, the products are both 1/2 inch thick of similar materials and both are interlocking designed. I'm not qualified to say which material or which company offers the better product but since I've had trail Armor skid plates on all my vehicles, I can attest to the fact I've had zero issues with them. They have with-stood the test of time. If you have had Super ATV skid plates speak up on how they've worked for you.
1 more thought. IMHO, don't waste your money on a metal skid plate.