i would assume on a unit level cost, these pagers are probably cheaper, as evidenced by recent Ukrainian advances, however the cost of actually getting these units in the hands of the people that need them is going to slowly approach infinity depending on how aggressively you wish to do it.

Also, other countries are allowed to sell military equipment, there’s nothing innately illegal with that. Although the people of those countries may not like it, they do generally have the rights to protest it however.