Long shot, but does this WP plugin exist?
 

I've had a good search around, but I can't find anything I'm looking for.

I've got a sex toy comparison site where I list a few sites where the toys are available. All of these posts have at least one seller that sells in US dollars and another in British pounds. Is there a plugin anywhere that will actively convert the currency amount listed in a post into another?

As in, I'd have a post where I'd say "This vibrator sells for $25 / £X at this store." and the plugin would convert the $25 to pounds, and stick it where the X is.

Any ideas? (I'd just list it in US dollars, but a good percentage of my sales come from the UK and I've had better conversions when I list both currencies.)

Can make a custom one. Contact me if you are interested.