If there are 180 total guests being invited, then the couple may only need 100 to 140 invitations. Always order a few extra invitations in case the couple realizes they forgot to add someone to the list. Also order extra envelopes in case mistakes are made when addressing the invites.
From time to time, you may probably think that you are the only couple who does not have enough money to have the wedding they have always wanted, but you could not be more wrong. Most couples today do not have too much money to spend on their wedding and this is the main reason for which they plan theirs on a tight budget. There is nothing wrong with that and the truth of the matter is that even though you have to plan your wedding around a tight budget, you can still have the wedding you have always wanted.