Hey there! 
Hello, I am interested in the developer kit, was wondering if you would take $6 for it?
I can't quite do $6 but I can take the price down to $10. On ebay the cheapest one you'll get is $20 so it's a great deal.
, Could you meet me at $8 and I will pick it up?
Okay fine, cash only, pick it up today and I can meet you at $8
great! Thanks!