The following is what I have noticed:
Study desk - 0.6-0.7 (no one seems to want these, so they sell for cheap)
Oil lamps - 0.5 (you get 2 for your hc now!)
Tubmasters - 0.6 (No one wants these anymore, so they offer mocha + holodice or something like that. I personally can get 2 for my hc, but that's just me...for now)
Majestic - 5.5 (Increasing due to the mass amount of people who want them)





)

. Maybe neext time you could state how many times you've seen an item go for a price of which you've provided.