There’s a cereal bowl on the left if that helps.

Depends on how dense the board is. Infill is a choice when printing, so more plastic means more cost. I get my filament from $10 to $20 kg. Depends on sales and colors and such. These prints cost me $2 ish.

Theres a cereal bowl to the left. No bananas in it tho.

Desk knick knacks.

I wouldn’t do that in the slicer, it’s too hard to align them. I don’t know about any alignment tools in slicers. I could do that in Fusion360, however.