LAPC-I & MCB-1 = Not cheap, but I paid more for my boxed Ensoniq SoundScape Elite. I needed these to complete my Roland collection though, so I can't feel too bad. 🤑
The CT3980 was surprisingly cheap, but the box isn't in too good of shape. I found that the seller included extra memory though! This one came from Malaysia though with no tracking info - so I'm just happy it made its way here.
The Roland SCD-15 wasn't too bad either - much less than for some of the unboxed versions I've seen on eBay and Craigslist, but the dude was in Italy so I paid more for shipping.