My former OD used to put the temp dissolveable collagen plugs in me for free. Many, many times. Other people have said that they were charged. I have no idea why some docs decide to charge for them or how they arrive at the cost for their patients or why some docs do it for free but I think it's worth noting that they sure don't need to cost a lot.
I would try the temporary ones first, if I were you. Have no idea what the cost is for those.
"People may not always remember exactly what you said or what you did, but they will always remember how you made them feel." ~ Unknown