Pick two.  This is the usual trade-off.  You'll probably have to do some legwork which will take time to complete in order to find a good, inexpensive sign.  Might have to design it yourself.
Last time I had a neon sign made, it was single-color, single element, and about 12" x 24".  It cost $150 to have made based on my sketch.  It is almost certainly 3x-4x that much, now, if i asked for an identical sign.  They were fast and the sign still works.  +Good +Fast -Cheap
My brother has a Bud Light sign.  -Good +Fast +Cheap (he won it in a bet.  -good because bud light is carbonated urine.)
Once in a while you'll get lucky but the tradeoff gods will usually require you to put in effort or money before you find what you want.