Harbor Freight sells powderless nitrile gloves in several thicknesses including 9 mil, 7 mill, 5 mil and 3 mil. They can be had in 100 count boxes for around $10, closer to $5 when they're on sale. http://www.google.com/url?sa=t&rct=j&q=nitrile%2Ballergies&source=web&cd=3&cad=rja&ved=0CDkQFjAC&url=http%3A%2F%2Fwww.research.northwestern.edu%2Fors%2Fsafety%2Fgeneral%2Fppe%2Fdocuments%2Fallergic-reactions-to-gloves.pdf&ei=x1O6UZX9O43C9QS-goDIDQ&usg=AFQjCNGB_bx43XW1SzfRqRJAbe9SnLysug&bvm=bv.47883778,d.eWU
Powerless and nitrile is important because many people are or become severely alergic to latex. Worse, many people aren't actually alergic to the letex but to the powder used to keep them fresh. Nitrile 3 mil Powderless Nitrile Gloves in medium or large can be found at Harbor Freight in 100 count boxes for $8.99 (regular price) or $5.49 on sale, last I looked.
Miind you 3 mils isn't the only 3 mils is mighty thin. To Do... 3-mil Nitrile Large : http://www.harborfreight.com/3-mil-nitrile-gloves-powder-free-large-100-pc-68491.html
medium http://www.harborfreight.com/3-mil-nitrile-gloves-powder-free-medium-100-pc-68490.html
$8.99 / $5.49