Paying for goods in USD - charges?

[trowelhead]

Hi all,

My business pays for some goods/services in USD. My bank and business credit card charge close to 3% (non sterling fee) for the privilege of handling these transactions.

These can really mount up, does anyone know of a way to avoid these fees? That's £30 in fees for each £1k spent...

I have looked into various business credit cards but most seem to charge these fees.

My thinking was to use some kind of pre paid travel card / forex card - anyone have experience with this?

Much obliged