Take a look at TractorHouse.com
LINK. You might find what you're looking for. There are a lot of tractor dealers who advertise on that site.
I found mine (Kubota L5030) through that site, it was at a small tractor dealership about forty miles from here.
I'm very fond of Kubotas as they are a great, solid tractor and hold their resale value. I wouldn't be afraid of a 1999 Kubota with only 1,000 hours on it IF it had been maintained.
Ed