To be honest the last couple I have had clearly have cost loads but could easily be knocked out by yourself with a nice font and some good paper…The one I had before the last two was pretty cool, although I don’t know if I should say that, as I did it! Was an animated wedding invite, featuring the couples’ cats.
If your in any way creative I would do them yourself maybe pay for professional printing, if not creative find a friend that is and offer them a few £’s…if really desperate give me a shout, could help you for a little bit of cash but not normal wedding invite costs. But really if it’s something basic, text only, I think paying loads for them is a bit insane.