Numark DXM-09 A three-channel mixer with great effects that can add some controlled flare to your mix. The sound quality is pretty good for the price and it features digital faders. Download PDF
Gemini PS-04 good starting point for effects on a budget. Plenty of connections, decent sound quality and some interesting effects.
Download PDF
Reloop RMX 40DSP A great budget club mixer with surprisingly good build quality. The effects synchronise well and there are plenty of channels and connections.
Numark DXM-09
Download PDF 
Gemini PS-04
Reloop RMX 40DSP