When it comes to antique coffee tables, there are a lot of factors that can affect the price. One of the biggest factors is the age of the table. Generally speaking, the older the table is, the more expensive it will be. Another big factor is the condition of the table. If it's in good condition, it will likely be pricier than one that's in poor condition. Other factors include things like material (wood vs. metal), size, and whether or not it has any special features or embellishments. Now, as for your specific question about an antique coffee table with a glass tray top... such a table could potentially fetch a pretty penny depending on all of those aforementioned factors. If we're talking about an old, small table that's in rough shape, you might be able to get away with paying $50 or so for it. However, if we're talking about a large, well-preserved table from the early 1900s, you could be looking at spending several hundred dollars - or even more!