Black SanDisk Sansa Clip+ 4 GB players are on sale for $18.99 at the Deal Fisher website. These are manufacturer refurbs, and shipping is free.
They also have black SanDisk Sansa Fuze+ 4 GB MP3 players for $19.99.
The Fuze+ deal is good for 15 more hours - it's currently 6 am US Pacific time. The Clip+ deal doesn't list any deadline.
I have never ordered from this website, so can't comment on their service, however on eBay, Deal Fisher is a top rated seller with 99.4% positive feedback.