where can i get sheets for dust mites and a plastic cover my bed?

I highly recommend that you get the Allergy Comfort sheets from Costco to protect against dust mites and other allergens. You can purchase a comfortor protector from Overstock that provides an integral part of your allergy prevention solution.

Allergy Comfort® luxurious Allergen Barrier sheets are made with an ultra-hygienic anti-allergen fabric which helps protect them against dust mite dander, pollen, odor, pet dander, and other allergens. The fabric is treated with an anti-microbial process which constitutes a state-of-the-art barrier, effective against dust mite dander as well as household and pet allergens, mold and bacteria that can affect bed linens. Allergy Comfort® fabric is a revolutionary barrier with superior seam construction, uniquely engineered to impede the deterioration of fabric from allergens.