They have to be Newcastle?
I have three used ones including bungs and tap I may consider selling.
You can buy new ones for ~$12 at thebeeressentials.com (no affiliation).
If you're talking about the big pressurized keg-cans (I think they're like 1.32 gallons), I've got two that you can have if you want them. Either pick up or pay for shipping/boxing from 34736. Send me a PM
I have four of the 5L mini-kegs, with reusable bungs, and the Party Star setup that I'm no longer using. I put all of one batch through the kegs, before setting them aside.
Willing to entertain offers on the entire setup...