The products are low end junk. The Israelis are working illegally with student visas or none at all.
Tell them you are reporting them to immigration. There is no set price. The price is as high as you will pay! The young Israeli's come after military service to "see the world" and rip you off while they are illegally here!
They get a %30 commission off sales. The communal housing they are required to live in is deducted from that %30 also.
Several laws are being broken here. Not to mention the outright shame of the "hard sell." Do whatever you can to spread the word and help stop these scammers!