Lee is correct. Used ones go for a LOT of $$ now. They were expensive even new. But WORTH the cost. I paid roughly $1,200-$1,300 when NEW. The latter UDP knowing they were on the verge of going defunct and they wouldn't sell direct-to-consumer anymore. There was a wait list even for existing owners. Which is the only reason I got one. They are audiophile grade top notch products that eclipse devices three times their price.
This ain't so bad though.......
OPPO BDP-105 3D Blu-ray Player 898072002110 | eBay
I know we talked a lot about them here on the forum when they were originally released and a lot of people agreed they were expensive THEN. Now the original price looks like a steal. I have both the BDP-105 and the UDP-205. The BDP is a top-notch audio dream to listen to and I have it in my audio-only 2-channel system as a reference player for SACD's and the like. I use the UDP upstairs in the "theater room" for the movies. They are heavy as hell for a blue-ray player. No doubt the large toroid being a factor along with the heavy AWG aluminum chassis.
One of the differences between the two besides the UHD aspect was the "smart" menu. They were more geared to a "home entertainment" player with 'apps' and the like in the main scroll menu back on the BDP. They did away with that in the UDP. More of a Utilitarian no bones about it top of the line audio/video player in the end of OPPO's run. But I suspect 99% of us here don't care about the APPS in a high-end audio player.........