In 2004, I had two done: routine: $65 (included five days/nights stay at the clinic with meds and monitoring). I could only find one testicle, the other was on its way down and was easy to get so he didn't charge me more. Was a yearling colt.
The other was a monorchid. One down, one up. Very up. He had to look inside the abdomen about 12" to find it. Seven days' stay at the clinic w/monitoring and frequent medications the first few days, also antibiotics and anti-inflammatories which we continued here after he came home. $140.
A routine gelding in 2005 of a two year old (farm call): $65 including meds/farm call fee.
A vet that loves horses and respects my opinions: priceless (and NOT A BIT overpriced, I might add).
Liz M.