If you have the means, buy a plane ticket and go to Marbach (Germany) next week end (Saturday 1st). It is mostly a tarantula show, but one of my good friends, André Leetz from France is always there. He is a top araneomorph breeder and usually has a few salticidae for sale. What is nice is you buy captive bred animals, not WC.
If not, I see you are in the UK, you could try to contact the British Tarantula Society, they might be able to point you to a local breeder, although generally speaking, araneomorphs are not as popular in the spider hobby as mygalomorphs,so it could be hard to find.
Keep in mind that to have animals legally exported from the US, they need to go through US Fish & Wildlife, will need to go cargo and you will need to clear customs in the UK.
If I remember right, the UK has certain "restrictions" for keeping Latrodectus spp. and other arachnids that are considered "hot", I think scorpions from the buthidae family for example, but otherwise I think it is pretty flexible for the rest. Make sure you inquire about your regulations.
If interested, I can send you a PM with a few contacts for you to look at, just let me know.