Offers?
I'm surprised nobody wants this, are the TDS3000 scopes uncommon or did they all come with the cover?
They all come with the cover.
I don't know how you'd gauge "common", but Tek is still selling the TDS3000 series after 17+ years. There's got to be quite a few of them out there.
Interestingly, the Tek product page says they're not updating the design to accommodate EU ROHS mandates, and once EU stocks are depleted that's it. Nothing about US and other markets, but it could be a sign the end is near.