I get them from Intaprint UK (
http://www.intaprintuk.com/ 01246 269595) Great service and price. They are used as official merchandise on pop concerts/tours and never had any complaints although being in the industry I can see they are cheap!
I use the C6 which on 2000 are 13p each plus delivery which is free on telephone orders over £100.00. Give Sharaon a call and tell her Simon from Soundscreen sent you and she will look after you.
They have loads of other acryllic products like fridge magnets etc etc but I do not sell them as I hate having lots of different stock.
As for the inserts, sometimes I use the laser print (£99.00 from comet) or sometimes I use the Koday Ink Jet, it depends on which one has the most ink/toner in it! I grab the cheapest paper I can find and print 25 on a sheet then cut 10 or so sheets at a time.
you can normally do 200 an hour watching rubbish on TV or 400 if you are actually concentrating!!!
Hope the above helps.
USING: Whatever it takes to get the job done...