Matt,
Keep looking and be patient. I've seen some decent used dumps in that price range, but perhaps not exactly what you are looking for. I've found several on Craigslist in that price range.... though i'm not sure if they had split gates or not. I feel you will be able to find something close to what you want, though you may have to modify it slightly after the purchase.... say, make a split gate out of a standard two way gate. I bought my trailer off of Craigslist..... and though its a little lighter than i was looking for, it was in near mint condition. I too will modify my gate come springtime. I paid a scant $2200 for mine, shown in a thread i started here a couple weeks ago.
A word of advice...... when you find one advertised in your price range, CALL ! Go look at it as soon as possible !! One thing i found is that in that price range.... they do not take long to sell.
Scott