Thankfully the engagement ring was free (a family heirloom seen to the right). As for the wedding bands, those will have to be brand new, and the research began about a month ago.
I went to the Jewlery Exchange in Sudbury and had an amazing experience. Was looking to a 14K 2mm yellow gold band, they had it, for under $100! It gets even better, because I was able to take it home the very same day. Amazing. Before going to big box stores I highly recommend checking out a wholesale retailer who cuts out the middle-man (and therefore the cost of a middle-man). Their selection was wide, but not what Cameron had in mind for his own band, so we are halfway done with this project. I personally think ring prices will go down after Christmas and New Years (but then there is Valentine's day, so my assumption may be very off).
As long as you avoid the timeframe of Black Friday until Valentine's Day you'll avoid the fake discounts from prices being marked up due to demand. I would shop in March if it wasn't so close to the wedding date.