Living in Greece, Nea Potidea

I presume you mean the blinds which pull down and up from above the windows and doors.The people who make and install them on your property are normally easy to find in any given area.You can try asking your neighbors,point to their blinds/tents and say you want the same and where is the shop for this,most Greeks speak English,walk around your area and you will probably see a shop that makes and installs them,ask in other shops,someone will tell you,speak with the locals,they will know.A word of advise..never drawer in your tent after its rained or just very damp air as this will lead to the tent drying whilst wet and cause spots of mould all over the underside which is unsightly and cannot be washed off,let the tent dry properly before you drawer it in.Or look on line at yellow business pages for your area,I prefer to ask locals as they know the good guys and the bad ones.