My business uses around 50 photo frames every week. We basically stick
things in them and sell them online. The frames we use come from
www.fastframes.co.uk and are their own make. Please feel free to check
them out. We mostly use A3 size - these can be viewed at
http://www.fastframes.co.uk/acatalog/Online_Catalogue_29_7_x_42cm__A3____Matt_Silver_Aluminium__Styrene__1087.html

The company isn't that great when it comes to customer service so I
want to know if the same sort of thing can be found elsewhere for
around the same price.

They must be A3 and must have PLASTIC not GLASS fronts as an option -
these are safer to ship. I am based in the UK.

They don't necessarily have to be aluminium but they should be of decent quality.

Many thanks for your help.