Hi - anyone know where I can get something like these?

Amazon.com - Safco Products SitStar Stool with Chrome Base, Black, 6660BL - Desk Chairs

Amazon.com - Boss B16245-BK Caressoft Medical/Drafting Stool with Back Cushion - Drafting Chairs

Key is they have to be for a tall / high table and height adjustable. Not seen any around so wondering where I should be looking.