Welcome Allessandro! Other Project friends may be based in Italy and i hope they will contact you and be able to meet your request. If not, I would not avoid buying Parosphromenus Sp. from your local shops, but ask the shops to order them in for you to ensure that you are not buying stock that has been held for too long in stressful conditions. I am assuming you would intend to breed these fish (so you will need a seperate tank away from the Boraras for that purpose),and thus it is better that you rescue trade fish from others who would merely consume them as ornamental decoration. You obviously have experience with planted tanks, but be sure to follow the advice available on this site which prioritises low pH and almost zero KH. Good luck!