i agree. i just bought those exact center caps that your looking at for $40 bucks and then had to spend another $2800 to get them installed. (i needed the soft 8 397 cragars to go around the center cap. then i needed 33's to go around the new wheels. then i needed a 4" lift to go around the tires. then i needed a Slip yoke eliminator to use the 4" lift. then some poison spyder rockers to protect me from damage that the 4" lift will carry me to. then a new 9000# winch to get me out of where the 4" lift just got me into. then a new winch bumper to mount the new winch to. then new gears to be able to turn the new 33's and all that weight. then new steering to handle turning those big heavy tires while i'm in the process of getting stuck so i can use the new winch. etc.....etc.....etc...)
so as you can see. buying center caps is more expensive than you think.