Title says all

 

Stones, wood, saplings, leaves, iron, grass, diamonds (maybe), glass, bricks

just a few suggestions as they are quite popular items.

 

Just to name a few: wood, stone, wool/dyes, bones, etc.

However, know that you have to sell these items by their worth or else people will not buy them. 1 stack of logs should go for 1 grass, however 1 stack of cobble/stone is only worth 1/9 of a grass.

 

Everyone's made great suggestions. If you're new, stick to selling things you can farm, wood, cobble, stone, wool, food, any mob drops. If you vote a lot and build up your grass stock or are a donor, sell your grass and diamonds to get more of either one you want. If you want to make money, try to sell your grass for more than you buy (and the same for everything else).

Hope your trades work out well.

 

Quartz can be obtained at mob arena and they're worth quite a bit

 

Sell all the basics at the start (all different woods, cobblestone, etc.).

 

I think selling wood is a great idea because a lot of people need wood, it will sell quickly! If you have enough diamonds you could buy spawners for cheap and sell them for more! Good Luck with your Trade shop