To be honest, I'd stick to velcro for now
I invested in an el-cheapo snapper-thingee from Spotlight in the early days, and it just wasn't up to the job. It could only cope with one thin layer of fabric, and the snaps for it were hard to find and really expensive.
We used only velcro on our naps until recently when I splurged on a press, and they were absolutely fine, and perfectly tidy. DH actually prefers them to snaps because they're easier to do up! Also unfortunately easier to undo for sneaky wee possums, but that's another story
There may be a snapping service near you?