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.