WTB 56 cm tri or 58 cm road

Hello,

College student here looking for a bike to start training for a couple tri's this summer.

I don't have much to spend so am looking for a bike less than a $1000, either a 56 cm tri bike or a 58 cm road.

Not picky when it comes to the year, just looking for a bike in good shape to get me started.  

Thanks,

Andrew