The 30D has been long superseded by the 40 and 50D. You'd have to buy it used, as I did with mine - eBay is a good option, as is ffordes or parkcameras. No reason to have the 30D over the D90 other than personal preference - I went for the canon because I had a canon lens already.
Speaking of lenses, they are much more important than bodies, if your budget is limited devote more, lots more of it to quality glass than bodies. Optics last forever while bodies come and go...likewise the lens is resposible for more of the image 'quality' than the body. Finally you need a camera that you are comfortable with - only you can decide that.
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