Bill,
The 295/75R 22.5 tire size is a common truck tire made by many manufactures and is reasonably priced most of the time.
Your 295/80R 22.5 is a larger tire size with much more carry capacity. It is mostly used as a RV tire and therefore many less unit sales so only 2 or 3 manufactures make this size and boy does the cost go up up and away. I was recently quoted over $1000 out the door for Michelins when my 295/75R 22.5 AL11 Hankooks cost me $315 per tire out the door.
For your steer axle, 295/80R 225 is the only tire to consider because of the weight capacity needed.
Hope this helps.
Trainer