Yep definitely check the running costs of a laser printer. The actual purchase price can be quite low, but the cost of a new set of toner cartridges can be huge. Although they will last a long time for you.
DIY decals are good - pretty easy to make, but always do a test print before using your decal paper.
I've only used a laser printer, but I understand you can do them using an inkjet, put you need to spray them with some kind of fixative, before getting them wet.
