gu10 bulb replacement

[Deacon]

Hi everyone! I just received a new astro from mathmos that I purchased for my father's birthday. It uses a gu10 35w bulb. Since I'm in the US I purchased a voltage converter that I saw several of you recommend. I would also like to order an extra bulb or two for him to have on hand just in case. Can anyone tell me a good source for 240v bulbs and what kind (bright white, soft white...). Any help would be appreciated. I'm excited for him to open this thing up! He had a vintage lamp that was unfortunately broken by movers a few years ago. Every so often he'll say how much he misses the lava lamp. I'm sure he's going to love it.