The cheapest I know of is Joseph VH at: http://starlite.multiservers.com/index.htm
Right now he has a special on Rivotril (foreign Roche name brand Clonazepam) 150 2mg tabs for $78. Shipping is really cheap too, regular shipping for 2 items was $4.09! I don't know what formula Joseph uses to compute that, but I wasn't about to argue. According to the feedback page, his products are high-quality and his packaging is very discrete. Shipping half-way around the world takes about 2 weeks on average and he's really friendly to boot.
Here's a link to the feedback page.