Try Etsy or modern wall graphic,Dali Decals, or www.uppercaseliving.com. These are the websites I've gathered from others on the bump. I haven't done one yet but I want to! Good luck!
Any commercial sign company can cut vinyl letters for you - you can get the typeface of your choice and any phrase you can imagine. It's not that expensive and where I live I can usually get the order done while I wait.
I baught letters from JoAnn fabrics. One of them worked great and the other did not go on as well and there is a small area in the decal that I have to re-press to the wall occasionally. I ordered large decals for LO's room off Esty and am hoping they work as well. Work slow and be patient when you put them on.
If you have a Cricut machine or know anyone with one you can cut it out yourself! Kind of expensive to buy for one project but maybe a friend has one you can borrow?
Re: Vinyl Lettering / Quote On Wall????
DD2 8.22.13
MMC 1.4.17 at 16w
Expecting #3, EDD 1.29.18