Which is a better option for making dosa batter. Indian mixie or US blender?
You can buy Indian style
Mixie's in the USA. What I found was Preethi brand. They sell for what looks like between $150-$250USD. From the description of the appliance, they are spice grinders in addition to being mixers, so a blender may not be quite a proper substitute, however we do have a lot of blenders, food processors and standup mixers to choose from, so you may eventually have a full set of Kitchen appliances up to the task, but I think you will either want to bring your mixie or buy a new mixie when you get here if you want an appliance that does exactly what the mixie does.

I may even have to buy one now.