'Sponsor a brick' type fundraising

[narkymark]

I have an oddball enquiry (and apologise in advance if this has already been covered). I'm after some bespoke bricks - standard size housebricks, not fussy on colour but want them to have some details cast on at the moulding stage. Something similar to the schemes offered by some premiership football clubs building new stadium over the last few years. I'm only after a quantity of 500 or so.

Anyone any ideas? Any brick manufacturers checked with so far are talking about runs of tens of thousands.

Thanks in advance,
Mark