Can anybody recommend a cheap UK forwarding website?

[Phenomenal Flea]

I've been looking around for sites that will forward parcels from the UK internationally for cheap, but it doesn't look like I'm going to get away with spending well more than I'm comfortable paying. The site I want to order something off doesn't offer international shipping. I've got extended family in the UK, but, uhh, I almost feel that'd be rude to ask them to do so for me, haha! I can't really justify signup/membership fees, since it's just a one-off thing!
If anybody could pass on any recommendations, or if somebody is willing to give me a hand, that'd be excellent!