recently upgraded to the SP-404a, looking to unload my 303. totally functional, a little cosmetic damage but nothing huge. i recently opened it up and cleaned all the pots and everything.
$280ppd, US only (if you're outside the US and you REALLY want this we can work out something with the exorbitant shipping costs)
https://reverb.com/item/14480440-boss-sp-303-dr-sample-with-125mb-smartmedia-card-free-shipping#description-tab