How about Monica Ali or Andrew Motion talking about poetry, or even Sylvia Plath, reading her own in your class? For free, and you don't have to book them?
I have just discovered (thanks to Society of Authors, The Author) http://www.poetryarchive.org Dozens of poets recorded reading their own work, and some, like Ali, Motion, Ted Hughes, exploring poetry, giving personal responses to poems, 'teaching' poetry. You'd need to have online facility in your teaching situation to use the sound aspect.
It's more poetry appreciation than writing it. But the 'For Teachers' section offers whole lesson plans and of course can be adapted. Inside this section I found a link to http://www.teachit.co.uk which is chock full of English teaching ideas, resources and online interactive 'Whizzy things'.
As usual these teaching sites are aimed at schools-teaching, not adults. However, materials at A-level and even GCSEs -- heck, even children! -- easily adaptable, or spring-boardable for us who teach adults.