How is it that some sellers are selling the same item but under a different seller I.D.

[nhd1951]

I have been watching an expanda caravan for some weeks now. trouble is that it keeps disapearing but then shows up under another sellers I.D.

I was so close to paying for it the first time, only twigged when the bank account was in London and a under a different name,

Now it is on again and yet again another sellers I.D.