Have you a copy of Adobe Distiller? if not try Cute PDF and you can get it here; http://www.cutepdf.com/products/cutepdf/writer.asp
Also have a look at PDF 995 as I have heard good reports about it but have not used it: http://www.pdf995.com/
Final thought if you want to make money with your designs why not upgrade your software to the Pro version it is worth the money just for the PDF export filter. If you have bought PS why not upgrade and get Acro Pro as it is one of the Adobe products it worth the money if you upgrade to the CS suite.