A lot of people have them made and shipped over from china, some of the ladies on here would swear by them. As for stores it depends how many you have, what colour you need etc. I recently bought mine from h&m in the sale and got 6 for £95.
Big department stores like house of F (i used to work there), have massive sales this time of year. The eveningwear department have dresses from as little as £30 but it can be difficult to find all the sizes you need although they do postal orders from other stores.

Might also be worth trying places like Dorothy P and other high street stores. I have a friend who chose navy and told her maids to get their own dresses. They all went shopping and on the day surprised the bride with lovely dresses from primark that cost £6 each!!

Good luck xx

Make them yourself, or find a friend /family who can!

Take a look on the bh$ website or instore.I got my bridesmaid dresses from there,reduced to £37.50 from £125 because its end of 'wedding season'.They have got some brill bargains!!Best thing to do for suits would probably be to just call round different places and see who offers you the best price for hiring,I just went for the suit hire shop thats next door to the bridal shop where my dress is coming from because its easier (and they do good offers too) lol xx

Im making mine, that way I can pick good fabric and make sure they are done properly! I will be able to make all three dresses for £75. Suits I shopped around, consider dinner dress (tuxedos) or kilts as these are cheaper then just grey suits. You could also buy nice suits from mata!an these days!

High street is always a good option, especially during the sales x

Mine were from she who can't be named, and they were amazing and well made. £85 each.