Wedding Invite question

Sarah
I've looked on so many websites and have no idea... When is a good time to send out wedding invitations? My fiancé and I aren't doing "Save-the-Dates" due to not wanting to send them and we don't have room in the budget for them anyway. I've seen that you should send invites 4-6 weeks, 6-8 weeks and 8-12 weeks out from the date. I feel that 4-6 weeks is not enough time to give people who need to travel enough time to take off of work and make travel arrangements. My parents are having our wedding shower in June or July, 3-4 months before the wedding in October, so our invites would have to be out already, right?