Hi Yoni,
Didn't have any more luck than you finding the exact part you're looking for; you might consider contacting the manufacturer regarding where to get exact replacement parts.
Having said that, I did find a couple of possibilities for you. The first one is one I'm a little doubtful of; it's the exact same manufacturer, but it's a slightly different model. This one is only 10VA power output rather than 15VA, so I'd be leery of using it as a replacement, but since it's the closest I found, I figured I'd present it to you as an option.
[link|https://www.ebay.com/itm/224919525248|Prince Castle - Basler BE220810GDD 10VA Transformer 240V Primary, 12V Secondary - eBay]
The second one is a part I located by searching using your specifications on digikey.com and mouser.com. This one is actually rated at 24VA, so it will handle all the power you need and then some. You do, however, have to wire it yourself; it's got multiple taps on both sides, so you have to connect the two center pins (2 and 3) on both the input and output sides, and use the two outer pins (1 and 4) as the primary input and secondary output.
[link|https://www.mouser.com/ProductDetail/Triad-Magnetics/F-106Z?qs=VZvlzY8g9V%2F%2FN6ev84jKeQ%3D%3D|F-106Z Triad Magnetics - Mouser]
The data sheet has details on how to wire it and all the specifications.
[link|https://www.mouser.com/datasheet/2/410/F_106Z-780723.pdf|Power Transformers]
Hope that helps; let us know how it all turns out!