Printing them yourself at home is the cheapest if black and white and on a laser printer. I can print 5000 for £14.00
I've never checked the costs but I do this too. 2 up on A4 and guillotined. I have a printer with a duplex unit for ease of use. Designed (if you can call it a design
) in MS Publisher.
I can change the design fairly easily so may well try some area personalisation on my next run.