Ashley, if money isn’t an obstacle, by all means get bumper plates. It’s pretty easy to make a weightlifting platform so that you don’t mess up the floor. Here are some instructions: http://www.ironmind.com/ironmind/opencms/Main/homesweathome6.html
In terms of bumper plates, one of the cheapest deals I’ve every got was from here: http://www.roguefitness.com/new-hg-rogue-bumpers.php
However, even that isn’t cheap. So if you just want your usual non-bumper plates, just get the cheapest deal you can. If you get Olympic barbell set, it will be official size.
I grew up in a rural community, so I know how hard it can be to get stuff sometimes.