When I needed my mares ultrasounded, my equine vet didn't have the equipment, but said she would have been willing to do them if she did. So, I told her I would be willing to pay for the "wand" for the internal ultrasounds as they were important to my program, and I guess "shamed" her into it, because she bought the piece, and then used my herd for "practice" at no charge for the next year. I had each mare ultrasounded 3 times that year so I could watch the pregnancies progress, and the twins disappear/absorb. Fascinating!