A search on eBay for "proto board" gave me quite a few different options. eg 10 of these for less than £5 including delivery from a UK-based seller.
These look pretty good: http://www.ebay.com/itm/Three-1-2-Size-Proto-Board-AST1108-E02-PCB-for-prototyping-small-foot-prints-/192081750911 (Hmm. Same seller that Bob mentioned...)
I deliberately AVOIDED picking ADA's offerings.
I have been using the Adafruit Perma-Proto boards, which are excellent. They have the same configuration as a breadboard, just that you can solder them for permanent projects. Problem is they are quite expensive. I am familiar with normal veroboard, but I don't like it. I much prefer the convenience of Adafruit perma proto boards. Does anyone know if there are any cheaper unbranded solderable boards with the same function as the Adafruit perma proto boards? I thought there must be some Chinese copies but I can't find any?