In that case I have this bridge I'm selling cheap...
I've never mailed a stranger a money order in my life. Do an escrow, make it easier to entice someone to buy these instead of putting an additional hurdle in the way, because they aren't priced all that cheap, I can get entire seats from a junkyard for less than that, or aftermarket seat covers that just get tossed on in 10 minutes for under $150.
You are asking a premium price and to jump through a hoop for vehicles now 13 years old.
Too expensive, strike one. Risky payment method, strike two. Not even clean (pics show this) strike three. Needing substantial labor to remove existing seat covers and put these on, strike four.
I'm not trying to be hard on you, I support reselling needed parts to those who need them. It's a great service to the community but I don't see those selling within the terms you've set, so you'll probably spend a lot more time till you get to a place where buyers are enticed.
Good luck, if you sell them within those terms then I'm happy for you and the buyer who deemed them worth this gauntlet, but to me those look like something you would offer free on craigslist and throw away if nobody claims them within 6 months
People don't own vehicles that old with a mindset that they want to put any more money into it than necessary. That's the whole point of owning an older vehicle, that it's cheaper. If it's brakes or a ball joint, some real safety issue then it's an investment in safety and necessary, but a little bit better (but not perfect) seat covers, not so much.