Look around, i got a used Toro pro line 36" this past year for $850 with a sulky. He was a friend of mine but take your time, do the research on the mowers you are looking for and make sure it will work for you.
My Equipment thread:
Goal is at least 30 regular mowing accounts for 2015!
2011 Ferris 48" Comfort Control DD
2001 Toro 36" Belt Drive
5x12 Carry On Trailer
2001 Ford f-150 XLT