On the average on Ebay I've seen DCP-150's that are in excellent condition and functions flawlessly but not complete w/ all acessories sell for about $250+/- . DCP-150 complete w/ all acessories (battery, remote control, carrying pouch, manuals, and original box) in excellent condition and functions flawlessly will go for about $300+ on Ebay. Head-fi member spwal sold his DCP-150 that was in excellent condition and fully functioning complete w/ all acessories including owner's manual and original box for $429 on Ebay a while back. I have also seen DCP-150's that were broken w/o it's acessories go for $150 on Ebay. The DCP-150 IMO is the best sounding vintage PCDP and is certainly considerably rarer than the DCP-100 and the Sony D-311 (in fact rarer than most vintage PCDP's that's currently available on Ebay). To me it is the only vintage PCDP that comes closest to sounding like a fullsize CDP. It does not however surpass the sonic qualities of a fullsize CDP. The DCP-150 also has a digital line out that the DCP-100 doesn't have.
The DCP-150 offers a very accurate and detailed sound with a wide soundstage. More detailed and with a wider soundstage than any other PCDP's that I had the opportunity to listen to and own. You won't often see a DCP-150 appear on Ebay, but when it does there will always be a bidding war for it and the price will climb skywards. If you're lucky sometimes you may be able to find a DCP-150 for a price that is a steal, you just have to have the patience and know where to look.