Basic need is to reduce airborne contaminants, and reduce them further
with a HEPA filter. A good way is to make and work inside a plastic tent.
http://www.omnisterra.com/botany/cp/slides/tc/tc.htm (kitchen table
tissue culture)
Go for the plants that seem too expensive---blueberries would be a good
choice, or outside the garden and orchard category, expensive flowers.