There are LOTS of places to buy 110mm BCD five arm chainrings.
I have a TA on one bike, a Stronglight big ring on another, and a generic that did not even have a name label on it on another bike, I think I have a Salsa on another crankset. Don't get to focused on only one brand.
Keep in mind that a different chainring that does not have pins and ramps in the right spots will not shift as smooth. That is not a big deal, before ramps and pins were added to chainrings, we all managed to shift ok in the old days, but it may be noticeable. And your front derailleur will need to be dropped down a bit with a smaller chainring.
Initially until you see how the new chainring works, I would not remove any chainlinks in case you want to go back to the 50. We have asked a couple times what cassette you have, you have not given that info. If you want lower gearing you might want a cassette with a bigger biggest sprocket, in which case you would probably need those links back.
If you order from Bike24, they have a significant shipping fee for the first item, but after that first item the shipping rate does not rise much if any, so you can get some great bargains from them if you are looking for anything else. That is where I bought my Rohloff hub eight years ago.
BikeInn is another source. Shipping may be lower.
https://www.tradeinn.com/bikeinn/en/...nrings/12469/s
Do not buy a Campy compatible 110mm five arm chainring, they are different than everybody else's 110mm chainrings.
Good luck.