Or don't even bother with bridesmaids. You don't have to have them, and if you do, they don't have to all be dressed the same.
you don't need to sort out the best man's outfit either, if you are having a best man he can just wear whatever suit he has.
I agree with buying in season flowers. Also, you don't have to have centre pieces on every table, and if you do, they don't have to be flowers. I went to a wedding where there was a plate of lovely grapes in the middle of each table, that went down very well indeed and they were all eaten.
Another wedding I went to had olives, humous and lovely bead on the centre of each table, which was then the starter.
I am making my own invitations and save the date cards, already designed then on photoshop, just need to print them out. Buying the card on ebay for £10 and then the ink will cost a max of £20 so pretty good really. will see if staples is cheaper for the printing though. Worth a look.