http://www.silkscreeningsupplies.com/site/799934/product/lg4x1
this is the one the guys on t shirt forums gave good praise of in a particular post

here is a different one but cheaper

http://www.ecrater.com/p/2357332/4-color-1-station-table-top-screen

here is one I found for a lower price linked from a person selling it on ebay. 99% positive feedback
http://www.ecrater.com/p/2357237/4-color-1-station-manual-screen-printing