So far as I know, there is no such thing as a "WOMBA" ball. There is a "WOMA"...which is a ball python morph that is certainly not worthless. However I don't know what the market price is for them so I can't advise you on that score. There is also a "woma python" which is an entirely different species and much more advanced than a ball python...they get a lot bigger and are sometimes temperamental. So you definitely want to be sure which species they're talking about. And if the seller is spelling it "womba" there's a good chance he really has no idea what it is and it may be simply a normal.
If you could get us pictures, we could help ID it for you.
Not sure what you meant about the mice in the deal. But my advice would be that if you're struggling to care for your current collection of seven, then I would NOT consider ANY deal that included bringing in a new snake...especially one that you don't sound particularly certain of anyhow.
Going strictly on the info given without hearing anything else, I'd say this offer would be more wisely passed on.
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