I picked up a real nice glow driver from Radio South. It has LED's on the front panel that indicate that you have a good glow plug or not. Rechargeable with the pack that comes with the glow driver. It's about 2 inches square or so and is very compact and neat in that you can wrap the cable around the provided bracket on the unit. Cost, though, is $74.99. See the picture. My instructor has one of their older models and has had it for years now. So, that may justify the cost if you are considering something like that.
Our club dues are $75.00/year, we have 82 members. Our field is not leased, we have permission from the NJ Department of Forestry to use it, it's a full-scale grass runway that they use for their water tankers during forest fire conditions (we live in the pine barons of southern and central NJ... no it's not all like Newark..

.
DS.