Here are some possibilities from this website
http://www.air-purifier-power.com/formaldehydedangers.html (they are selling air purifiers, but the info is most likely still valid). Hopefully, this will give you a jumping off point for research:
Home Furnishings •carpet pads/backings,
•draperies,
•upholstery,
•leather (leather tanning agents),
•glues,
•dyes,
•wallpaper,
•formica and bakelite in counter tops, furniture, and automobile interiors.
Household Products •household antiseptics, germicides, and fungicides,
•coated paper products, where formaldehyde improves water and grease resistance, includes grocery bags, paper plates, paper towels,
•air fresheners,
•rug and upholstery cleaners,
•scatter rugs and bath mats, resin-coated rugs
•toilet bowl cleaners,
•water softening chemicals,
•felt tip markers,
•dish-washing liquids,
•fabric softeners,
•shoe-care agents,
•carpet cleaners
•many soft plastics,
•rubberized items,
•synthetic lubricants,
•car wash detergent
Personal Products •cosmetics,
•shampoos,
•bubble baths,
•hair conditioners,
•fingernail hardener,
•fingernail polish remover,
•fragrances,
•anhidrotics (antiperspirants),
•and some pet shampoos (up to .1% formaldehyde)
Fabric and Clothing•permanent press fabrics,
•and tanned leather goods.
In Medicine Formaldehyde is widely used as a fumigant in hospitals and laboratories.
Formaldehyde is a component of many medicines, including;
•many vaccinations,
•wart remedies,
•medicated creams,
•orthopedic casts,
•dental root canal preparation disinfectants and sealants,
•cardiac drugs,
•antihistamines,
•some athlete's foot remedies,
•cough drops,
•skin disinfectants,
•mouthwashes,
•spermicidal creams,
•disinfectant for vasectomies,
•and enteric slow-release pill coatings.
In Food and Agriculture Many slow-release fertilizers are based on urea-formaldehyde.
Formaldehyde is heavily and widely employed in agriculture for seed treatment, stored crop fumigation, and soil disinfection.
It is added to animal feed as a preservative, and to improve handling characteristics of animal fat and oilseed cattle food mixtures.
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