i had been dealing with question if i want to install used power steering pump in my car that i had bought from this forum or have it a go with a refurbished one

My friend has killed 3 or 4 PS pumps because the openings were not sealed when they were taken out of the other cars so than dirt went in which killed PS pump.
So my question is does anybody know if i can get a rebuilt PS pump in Europe? I would rather not buy from USA because of import charges.
Or another option is to buy a new aftermarket PS pump, does anybody know where i can get it?
Or maybe i should take my pump to a specialist where he will take it apart and than clean it, but not sure how much that would cost me, i hope not too much lol
Thanks for your thoughts!