The short question is no, and I don't think it helps to post duplicate questions (http://apiforum.e-conomic.com/17205/is-there-way-to-get-all-productpricehandle-from-single-call)
Unless e-conomic has implemeted this feature and just forgot to tell about it, the the current only way to the all product prices, is to iterate throug your products.
From a former mail conversation I had with the e-conomic API team in January last year, they where well aware of this issue, and made an internally change request for this.
However I do not know the status of this change request, neither when an update to the API will be avaliable.