Tanya; I purchased a 50 yd roll of stabilizer @ Discount Embroidery Supplies a couple of years ago. They generally have great prices onlots of embroidery supplies and no shipping!! What I purchased is a tear away, and it is quite heavy for tear away. You didn't mention what type you would like other than heavy weight. A thought for you is, instead of a trying a very heavy stabilizer use more than one layer. If one layer of your heavyweight isn't heavy enough you can add an additional layer. If it is so thick that you can't hoop it then 'float' it under your hoop after your stabilizer & project are hooped. You can baste in the hoop so it won't move (if your machine has that function) or use a spray adhesive like KK2000 , spray the additional piece of stabilizer in the hoop area and attach it to the bottom of your hoop area. HTH
http://www.discountembroiderysupply.com/