Here's my $10 DIY cupholders. The PVC is a 4" to 3.5" reducer and the internal shape is perfect for travel mugs and for cold drink cups.
In the pic you can see that the sides of the one farthest back were trimmed to fit the console and I cut some non-skid discs from the wife's kitchen drawer sheets to put into the holders. What you can't see too well is that both of the holders are glued to a clear plexi base that was cut to fit the console. The wood trim is koa veneer glued to the rims and clearcoated.