This was available as merch during '95/Bowie Outside Tour etc.
PJLM adds:
"The "two lumps please" mug from the 1995 shows in the UK were sold for 12$ in Petaluma and San Francisco.
They were supposedly sold out after that, although it is not impossible that some were for sale on certain dates of the second leg of this tour."
Generally considered rare(ish).
Regards,
FWD.