To the OP, I've been buying up DVDA and SACDs including some OOP titles for the last year or so. The most expensive disc I've ever bought is actually not an SACD but a 1:1 Direct Cut CD from Yes Asia :)
But honestly, you can find a lot of SHM SACDs from Japan (look at CD Japan or Amazon JP or HMV Japan). I am more likely to go broke than run out of titles to buy. Just some of the albums I've gotten include new releases of old albums from Dire Straits, Queen, Stevie Wonder, Diana Krall. I've also gotten some recent titles from Warner Japan (Hybrid SACDs) and MoFi US.