Although I only own a dozen or so props I can share my experience with quite some dealers (I am located in Germany):
- The Propstore:
I got some items both from their UK and US store and also sent in an item for signing, all without problems. They are extremely professional and flexible when it comes to payment plans or combined shipping.
They are unfortunately not at all open for any offers/bargaining. This is rather a shame as they have a very strict pricing scheme depending on movie and so some of their items sit in their warehouse forever.
- Screen Used
Very friendly guys and although their website isn't always working 100%, everything worked out fine. I got a reasonable discount although it was not an "make offer" item and shipping was fast (had it sent to Borderlinx who sent it to Germany).
- Hollywood History online
It is not that Wes is unfriendly, but overall I found this to be a rather unpleasant transaction. I already heard his stuff is overpriced. But the sword I got (which supposed to be from The Mummy) had a tag with "Mummy Ret." on it and for a Mummy Returns stunt sword was way overpriced. He says it is from "The Mummy" and the tag was from another item - I can't prove he is lying, but I don't believe him. He ignored my objections that scene the sword is supposed to be from is fully CGI.
Besides that, shipping was fast, no problems there.
- The Prop Gallery
Del from the UK has a rather limited selection of stuff from the UK obviously, mostly Dr. Who. But there are some nice finds from time to time. He is is willing to bargain depending on item, some items he had for some time have room for 30% or an extra item packed in, others he won't go down.
I like to talk to him from time to time, unfortunately the british pound is very strong, so for US or continental Euro buyers the prices are steep. Not his fault and the items I got arrived quickly and safely.
- Prop Masters
David is based in the UK too and has a rather interesting mix of props and movies. I found one of the last Banquet Beetles and although the price was steep with little room for bargain I got easily one of the most perfect specimen available (most of them seem to have gone through his hands). And it arrived quickly and safely at my door.
Conclusion:
Impressions are mostly positive (avoided Premiere props due to this topic) but I can't and won't judge if the items I got are genuine, but at least I am under the impression they are from all of these sellers.
I would buy from all these again - even Hollywood History, though I doubt I would find another item he would make a price for I find reasonable.