Sources for GFP's

[Stephen Kolaczkowski]

I am looking for a source of GFP's (wild type and/or one of the S65 
mutants) being expressed in E. coli or some other single celled host.  
Two of my students in my biochemistry lab course would like to try to 
isolate the protein as part of their lab experience.  I am not 
interested in working up the DNA or any work beyond simply isolating the 
proteins.  Thanx