I personally contacted a metalworker in my country. It was very simple. I told him that I need a plate forged out of a piece of metal. It should resemble a barbell plate, The inside diameter of the plate should be 50.2 - 50.8mm and I specified that it needs to fit an olympic barbell. The weight of the plate should be 0.5kg (1lbs) and I ordered 8 pieces. I'm in somewhat your situation atm, my gym also doesnt have 1.25kg (2.5lbs) plates. I just contacted the same guy and had him make me a pair of 1.25kg(2.5lbs) plates wich I intend on bringing with me to the gym. There is no other alternative imo. If you are reluctant to buy online try doing it this way, you might save some cash along the way.
Here is how they look: 23584604_1491348837619887_697598628_n.jpg23574282_1491348847619886_1638692572_n.jpg23584517_1491348897619881_288237460_n.jpg
References: My Plates Don't Fit Your Bar! | Ivanko - Official Website of Ivanko Barbell Company