BG event updating on rails

Hello, i have an e commerce application that gets the product prices from an external service, the service sometimes takes a few seconds to respond, and there will be many user accessing the site. There are custom products so i cant just pull all the prices, i have to request it for each cart and re evaluate every time the cart is updated.

I have a solution that i would like to hear second opinions on. I think i could use beanstalk and faye to update the clients cart. Moving the external resquest to a beanstalk daemon and updating my app via faye. I am just not use the negative implication and if there is a better way to update the view after that has been a background process.

Suggestions will be very appreciated

I am just not sure of the negative implication