Sourcing a FX Barrel Attachment And Liner Lock

I have only found these at Huma but the VAT and Shipping are more than the parts making the cost go way beyond the value of the parts themselves.

I am looking to source a FX Barrel Attachment And Liner Lock Set in .25 so that I have a second barrel for my Maverick. I have the rest of the parts on their way but these two seem to be unobtainable in the states so far.

Ideas? Phone numbers? Web addresses? Some guy on the corner that only takes small bills in a plain envelope?
 
Trenier Airguns has the Huma caliber change kit, $110 - The Huma Air caliber exchange set with V2 dual hole transfer port makes it possible to change the caliber of your FX Impact with the use of your existing barrel sleeve and barrel shroud. Included is a stainless steel barrel attachment with the Huma Air V2 dual hole transfer port, a liner lock nut. Available with either a high flow pin probe or pellet probe and the supporting o-rings.