Hi,
Have you tried Pearl Paint, Cheap Joe's, Madison Art (they have nice taborets)- or any other art supply store? Please consider getting separate storage that slides beneath or is adjacent to the table. If price is an issue, catch sales, unify them via color.
How's your lighting? Personally, when I knit, etc. or draft, I use two light fixtures to eliminate shadows.
The link below provides a checklist of what to keep in mind when you shop.
Phttp://www.ncsu.edu/ehs/www99/right/handsMan/office/ergonomic.html

Allison
L5 ASSOCIATES