Here's an eBay auction that will appeal to anyone with a hundred dollars and a childlike willingness to believe. Being desperately lonely while living in a no-pets building can't hurt either. They're even offering free shipping, because hysterical delusions don't weigh all that much. Don't worry about if you and the dog don't get along. Just send your imaginary dog back and the seller will be happy to give you an imaginary refund.
Here's the product description, giving you a little background on your potentially new, and completely illusory, best friend:
"The imaginary dog is a female, and her name is Abby. Abby is a Cavalier King Charles Spaniel, and she is very good with kids. I've had her for about 5 months, and I can not keep her, because the new house I'm renting will not allow me to keep dogs their. I found Abby at the adoption center after she was living with a family that abused her. She is in great shape now, and is only about a year and a half old. This dog has to be bought soon, or I will have to take her to the pound. I will ship the dog to you in a small box with a few holes poked in the top so she can breathe. You will also get an imaginary food bowl, water bowl, leash, and collar. She is a very good dog, and you will not be disappointed with your purchase. I know she is very expensive, but it is very rare to find an imaginary dog like this one.
"The dog can not be returned, and all sales will be final. I only accept you paying through PayPal so it will be safer, and easier for both of us. I ship to all 50 States, and worldwide w/free shipping."