I've been lucky I guess some sell the snow globes so it just depends. I had to share a table with someone else and figured my Sim wouldn't make any money he ran to the table and placed his frogs there taking up the whole table but she was able to put her flowers on there, too. lol It was up to my Sim when to end the sale. And I could mark up the items (this was at the game's festival flea market) but didn't get any money when he sold his frogs so I guess that is o.k.
Yes you can buy those but I would like to see dining room furniture, stoves, fridges, art and other things like that