i dont think you will find any
That's one of the european sacs, so I wouldn't expect many to trickle through to the UK.Somebody on arachnophiles has a sack so there should be some out relatively soon. Expect to pay something in the region of £70 for a sling though.
Good luck Dan.I have a gravid female at the moment, and with a little luck, I may have a sac in a couple of months.