Set default currency rate to change depending on USD

Hello,
My website's default currency is set to USD because my suppliers deal in USD only. However my site is for Indian customers. However I want people to pay only in INR, whether they be from India or rest of the world. I know I can change it to default currency however there are so many price fluctuations! And since the price remains stagnant at the supplier's, my INR rates change automatically with conversion factors, which is not possible if it is the default currency.
So can you suggest me what to do in this case?

1. You need to create a script that will take currency rate from some online feed.

2. Now This should be dumped into data base field that handled conversion.

3. This script should be run via cron say every 4 hrs.

Way simpler just to modify the storefront so it defaults to and only shows INR.

rph wrote:Way simpler just to modify the storefront so it defaults to and only shows INR.

How can I do that? My store default is INR and i would like storefront to default to $$.

Thanks!

Looks like I was wrong. The storefront will still show in the default currency even when it's disabled and not selectable. This might require a more complex commercial solution.